A bruise or bruises found on someone's knee making it look as though they've given a ton of Blow Jobs recently. The bruise can be from anything but has to be on one or both knees. The bigger the bruise the bigger the slut.
Suzy "omg look at Trina's knees!"
Jenny "those are some pretty huge slut bruises, her boyfriend must be happy!"
Jenny "those are some pretty huge slut bruises, her boyfriend must be happy!"
by em-dizzle4sizzle May 24, 2011