a melted marshmallow is when a dude gives you a heavy blowjob, and you cum such a suprising amount (oh yes, you do it guy on guy, i know you like that) and your excess sperm drips out of his mouth like a melted marshmallow.
by Mallow-King October 19, 2009
To Ejaculate
by MrIanBear1001 December 02, 2010