Dong Bruise

A dong bruise is the bruises that appear on a girls legs after a hard night out in town, they never remember where they have come from but are actually caused by male dancers in close proximity by their flailing male appendages

"Oh my god look at these bruises on my thighs Kathy! I have no idea how I got these, boy was I boozed last night"

"I have a fair idea, they're dong bruises Jane, I told you not to dance so close to those huge guys"