boxer biscuits 

Someone goes #2 in their boxers.

Joe made some boxer biscuits when the person jumped out and scared him.

boxer biscuits by PlasmaSpock November 19, 2017

Boxer Biscuit 

When you have been continuously farting and your boxers absorb the filth. When you go to take a shit and drop your pants the stink is released into your face.

I had too much Mexican food last night and gave myself a boxer biscuit.it was nasty.

Boxer Biscuit by joemanshowman July 31, 2018