hit me

Literally what it says. "Hit me." If you say that to me I'll hit you in the forearm with a quick jab.

"Hit me."
*Punches him in the arm.*
"Ouch! What you do that for?!"

GMSD

GMSD is only used by people with a small dick, hence they can say "grab my small dick" or " good morning small dicc"

"Hey bro what's up, GMSD man!"

"Fuck off, mine ain't small like yours"