Top definition
masturbating with a marshmallow in your ass and farting and burping at the same time, hence the word "bart" = burp + fart. The fart can often be used to warm the mallow in prep for a smore.
Wow I'm having a lot of gas, I'm horney, and I would love a smore...I feel like marshturbarting
by Bill Mckiness October 06, 2008
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