While engaged in anal sex (without a condom) you start tickling her profusely. If she laughs or giggles you rip it out of her ass, smack her across her face with your dick and ask her what the fuck is so funny.
My girlfriend pulled a giggly susie, now her face is all bruised up.
A term generally used when referring to bricks of marijuana, due to it's nature to cause someone to become giggly.
Pot-head: Hey maan can I get a couple of them giggly bricks?
Seller: The fuck?
Pot-head: Giggly bricks, maan, you never heard of a giggly brick? You got some right there
Seller: You mean the weed?
P1 hey I have new job working for NASA
P2 why would nasa want you
P1 my giant gliggy has the capability to slow down a rocket engine due to its unique shape and size ,it acts like a air brake.
P2 what the fucks a gliggy
P1 my ear
Example 2
Spacex offered me job ,elon musk wants to bounce a 100 starlink satellites off my mega gliggy so it provides internet to remote locations in inbred areas