The area in between pressed-inward breasts (see also: cleavage, the valley)) where one would insert their penis (referred to by some as a pontoon ) to engage in mammary intercourse (see also: titfuck)

Coined by SizeQueenSupreme
He stuffed a Jackson into the stripper's pontoon pocket, fervently dreaming of jammin' his wang in there.
by Sukebe- No Kotoba August 31, 2008
Get the pontoon pocket mug.