Slap bank
A fantasy saved in a gentleman's mind for future use when masturbating.
One girlfriend to another girlfriend on girls' night out:
"God, I love your tits!! They are so big and amazing!! They are totally saved in all of the husbands' slap banks."
"God, I love your tits!! They are so big and amazing!! They are totally saved in all of the husbands' slap banks."