When you have a boner, and it's sticking out of the top of your pants. It looks like a muffin, so it is also known as a boner muffin.
Damn man, i was sitting in class today and the girl next to me saw my boner muffin sticking out of my pants, i think she liked it.
by SchmiddyMaster May 12, 2016
Get the boner muffinmug.