look up any word, like ratchet:
 
1.
Someone really annoying. Weasel-like, pushy, obnoxious.
Annoyed guy: "God, this guy who works in the cubicle next to mine just ratted me out to my boss when I showed up a little late."

Sympathetic friend: "What an ass finch!"
by rheabatz October 14, 2011
 
2.
A self-important, but really insignificant, noisy, persistent asshole whose job is to bother you.
That freakish assfinch at starbucks kept asking me questions about my f-ing latte like he's trying to paint the sistene chapel.
by cneg February 14, 2007