This term is for when
something/
someone you
desire is not directly available to you, and you want it.
Hot girl walks by you and her ass is just screaming for you, you might say to your friend next to you while you watch her walk away, "Lemme get that butthole!"
Your friend comes over with a 6-
pack of beers and your
thirst is not quenched, you might say, "Hey
dawg, you brought some beers! Lemme get!"