Definitions by Mushy bun

mushed bun 

During rectal intercourse, the male participant(s) displaces the original occupants of the aforementioned rectum with his elongated appendage. The probability of this phenomenon occuring is directly proportional distance inserted.

Oh golly, Fenston popped round earlier and left me with a mushed bun.

mushed bun by Mushy bun February 16, 2018