'Gregging' is the process by which an individual masturbates into a hat. Though this is its definition, it can also be used to describe an individual
resting his penis in a hat, and/ or using
the hat to masturbate. To 'Greg' someone is to steal their headwear, and perform one of these
heinous acts using it.
Example:
Example 1)
It has commonly been used to make amusing adjustments to songs:
"Gregging,Gregging you... filling up your beret with my penis"
Example 2)
Ray: "Man, what the fuck is up with your hat?"
James: "you wont believe it, Some punk
gregged it last night at the party!"
Ray: "Ouch, dont worry about it,
weve all been there before"
Example 3)
Mark: "Hey, look at that blokes hat, you want to greg it?"
Bryn: "Hell yeah!, ill go first"
30 minutes later
Man with Hat: "Bollocks"