Interested to know what you first used and to know for extra ideas.

For me the first food things I use were brownie batter and pudding. It was relatively inexpensive and easy way to start out.

Custard

Mine is a little odd. I would mix sugar and water in a glass, really thick. Then put my pecker in it, or pour it over my hard on, catching it in another glass. Back and forth. The grittiness slowly rolling off was very arousing.

My first sensation was much earlier. I was young, I tried to kick a ball out of a puddle in a field. My foot slid in mud, into the puddle, and I fell/slid into the muddy water. My jeans got wet and muddy, as did my hands. I didn't know why it felt good, but I knew I liked it!

Oatmeal for me

Shaving cream it was in the cabinet and it washed away without a trace.

I started with Dream Whip (the cheapest), followed eventually by Cool Whip, and finally by real pies. I eventually dunked my head (and watched other guys dunk theirs) in buckets of pre-made pudding. Chocolate syrup makes a nice topping too.

Canned clam chowder, cream of mushroom, gravy. Instant mashed potatoes was fun!

Custard!!!! Still using now and will never get tired of it.

My very first experience was with a single tin of beans down my boxers as a teenager. I remember getting crazily excited opening that up.

No food, but shaving cream.

Used just a little amount and rubbed it all over my cheek. The feeling was even more arousing than I had hoped for - so much so that I basically couldn't help myself anymore and less than 5 minutes later I found myself laying in my bed face-down in a plate full of shaving cream.

Big cans of cheese sauce

Chocolate syrup! The week before I was watching real sex 24 on HBO, they were doing a segment on fetishes and there was this one couple that was in this industrial mixing bowl with chocolate syrup. That's what really lit the fuse for me.

Kayley, I remember watching that show. It was so hot!

Shaving cream on a plate.

First food splosh: Custard. Simple, easy (ready-made, not making from powder, so just open and pour), feels wonderful, tastes and smells good, and of course, very very messy. Once the first dollop is flowing down inside your clothes, you know there's no going back.

First ever indoor messy sploshing though was with shaving cream and bubble bath. I found you can make a wonderfully gloopy mess if you fill a paper plate with shaving foam, then liberally pour some nice coloured bubble bath (ideally quality stuff like Radox) all over and through it, and then splat it onto your willing victim's clothing. I remember it made a truly glorious mess all down the back of a very smart knee length uniform skirt my then g/f wore for one of our sessions together.

not really a food per say, but I once covered myself in vegetable oil then later chocolate syrups and pies

cool whip, chocolate syrup, and eggs (no shells)

The first time I used cocoa dissolved into a paste, I started with my face and ended up all over my body.

Store bought pies (banana cream, coconut cream and keylime pies), Pepperidge Farm cakes with an extra layer of store bought frosting (usually lemon), banana milkshakes, green smoothies, applesauce and rice pudding.

As I got more daring I tried more extreme items like pasta sauce and salad dressing.

Chocolate syrup and cool whip

This is going back many years at this point. But if I can recall correctly the first item I used was very sticky caramel.

I wanna say it was Cool Whip...