The word used to describe a females (usually larger) breasts when she keeps a lot of stuff in her tits, almost like a pocket or a secondary purse. Objects have a tendency to disappear in squirrel tits until they resurface later.
"Damn, look at Jess! Girl just pulled out her phone, her money, and her pencil! Who knows what else shes got in there! Shes got squirrel tits."
by Gottaluvme42 September 24, 2014