1. To cup a huge pair of imaginary breasts in front of one's chest to intimate that a female has a fine pair of boobies. The international custom and recognised gesture of great rack.
2. To make this gesture and instead of saying boobs replace with any noun and people will know what you mean, to prove the power of gestitulation with a comical payoff
Did you see that chick (gestitulate) she had a cracking pair of Lambourghinis
The slut I banged last night did have a flange like a wizard’s sleeve but (gestitulate) had a sweet pair of Pepsi’s