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 biscuits
Someone goes #2 in their boxers.
Joe made some boxer biscuits when the person jumped out and scared him.