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2.
a sweet beast, esp. a football player;

originates from Garrison Hearst
You are such an Erst; I sweat you so badly.
by Annan E. Muss December 10, 2004
 
1.
Captures the essence of "being up for something" in a single word.

Can also mean excited or a fan of.
Are you erst to come to my place and play some hoops?

I'm too erst for the Giants, they're too good!

I'm erst that Marc finally got the job done and slept with Tara. Good for him.
by DasUber January 21, 2013