It's the excrement mixed with sperm that is squirted out of a woman, or man's asshole after punishing anal sex. Often, the receiver is given laxatives beforehand. Phonetically, it's spelled b-yoof.
Dude, I fucked that bitch's ass till she bufed.
by GrantR August 17, 2005
To be cool and/or hot.
Damn he/she is pretty god damn bufe.
by Long Shlong John1231 January 21, 2013