To get inebriated from caffeine, to the point that you start experiencing physical effects. Typically borders on overdose, like any good inebriation.
I got greast after that venti americano last night, and punched some guy in the face!
by bananaman2000 June 24, 2010
It's a word for when 2 horses love each other
Look at these 2 horses greasting
by HorseWithNose August 4, 2022