Top definition
The underwire from a bra when it works its way loose, poking a woman in her boobs.
Mary had worn that red bra too many times and it got frayed. Eventually the underwire worked its way out and poked her in the boobs. She unwittingly stuck herself with a boob shank.
by PMax March 16, 2008
Get the mug
Get a boob shank mug for your bunkmate Riley.