crotch mittens
To provide temporary relief whilst having cold hands; it is the use of a crotchal area, usually ones own, to use said crotch as a radiating heat source to envelope and warm ones hands.
Robyn's fingers were so cold from the blistering Chicago winter that she asked her boyfriend "do you have any gloves I can borrow?" Paul said "No", but suggested to Robyn "why don't you just stick your hands down your crotch for warmth, or better yet use mine as crotch mittens."