1 definition by 240490

Top Definition
A pair of trousers (usually an old pair of jogging bottoms with an elastic waistband) in which a male can comfortably masturbate whilst wearing, thus creating warmth on a cold night without the need for a duvet or blanket.

Called fap slacks across the Atlantic.
"I see mikes got his wank slacks on, guess we know what he'll be doing later!"
by 240490 September 21, 2012

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug