I'm new to WAM and I could use some advice on how to get messy without making too much of a mess because I have a roomate. What are some good things to use? I just want to get messy so bad lol

Shaving foam is great as it cleans up very easely but it leaves a soapy smell in the room. We like xanthan goo a lot as it is very cheap, doesn't smell and is easely disposed off.
Most types of food are a bit more work when it comes to cleaning up but are aften more fun too.

To an extent it depends on what kind of nd of experience you're after. Doing a full "bathing in slop" type thing is harder, but if you're into doing it clothed there are simpler options using much less, poured inside, that can still give an amazing experience and much easier cleanup.

Good idea to find some (private) mud but then mud is my thing
Using the bathroom/shower is trickier with a roommate but colourless gunge from one of the suppliers is easy to wash down the drain & feels great

Things like shower gel, liquid soap, custard, pudding, chocolate sauce are good to start with as the mess feels great and can be rinsed away easily down the drain when you're done (assuming you're getting messy in a bathtub or shower cubicle). And they don't leave a particularly unpleasant smell behind.