When your boner is so strong and hard it rips through your undies and pants. Mostly common in extremely strong people like Chuck Norris, and other individuals with rock hard cocks with strength stronger than most men.
"Dude, so that hot teacher Jessica was teaching class today on Sexual Health and I was so hard I had a boner break and everyone saw my rock hard cock"
by GeniusBansel December 29, 2017