Ah, allow me the pleasure of educating you a bit, then! (you're probably not the only one) The two are pretty much the same.
WAM - Wet And Messy. Most often food related. Anything smooth, gooey, thick or all of those. Foods such as honey, pudding, whipped cream, pancake syrup well smushed-up bananas and butter are my favorites. Either spread all over the body with a partner to slip and slide all over you, or it can be done by yourself. You can also be immersed in it in the bath tub, or it can be done outside. Some things used can only be outside due to not being water-soluble with the ability to dissolve and go down the bath tub or shower drain.
I don't necessarily care for some substances some other folks are turned on by, such as, believe it or not, oatmeal, raw eggs, grape jelly, peanut butter, spaghetti, (no sauce, especially for women) and a lot others. Those things, I have done to cater to a partner's love of them.
I have been a banana split more than a few times. I have sat on, wriggled in and full-body wallered on many cakes with MUCH more than the normal amount of frosting. I have also shared a bath tub full of honey with another woman, as well as a bathtub full of pudding. That feeling is exquisite, and I have more orgasms than I can count.