What is Boston Red Balls?
1.
The fine, time-honored tradition of fornicating with a woman who is menstrating, resulting in having a blood-red sack, then wiping the man's bloody ballbag all over said woman's face. (Also known as a Bloody Teabag).
"That dumb bitch didn't tell me she was bleeding this week, so I gave her the ol' Boston Red Balls."
See