Gib

A unit of measurement signifying 150 lbs.

“Did you see Keegan lost some weight. He’s down to 225lbs.”
“Bro no way! He’s 1.5 Gibs.”

i mean maybe

It simply means u dont know, or don't want to take the time to explain something. Commonly used when being told something you don't understand.

Billy: "Hey, Jim you know the capital of Nebraska right?"
Jim: "I mean maybe"
Billy: "Well what is it then?"
Jim: "I mean maybe"