The heart shaped sweatprint made from someones hot sweaty balls on a chair or other hard surface which may or may not be accompanied by an ass stamp.
That sweaty dude left a sackstamp on that chair.
The heart shaped sweatprint made by a mans hot, sweaty testicles on a chair or other hard surface. It may or may not be accompanied by an ass stamp.
When that dude left the sauna, he left a sack stamp behind.