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1.
A person who unrightfully TRIES to take the place of another, but is much too quiet and ridiculous , and thus cannot do it. This person is very annoying because they always seem to be around, but no one ever knows anything about them, because they are too quiet.

see supplanter
Here comes Ashley, she's such an asscricket.
by Jamie M (Scarf Tato) March 06, 2007
 
2.
When you have ass crickets, you are jumpy or nervous. Also to say irrelevant things.
Were you saying something, or was it the ass crickets again?
by Cleatus March 09, 2003
 
3.
Steady chirping sound emanating from crotch of pants by office worker sitting at desk after lunch trying unsuccessfully to sneak out a "silent but deadly" fart without surrounding cubicle mates taking notice as passed gas metabolizes itsef into a string of discrete and constant mini-farts.

The noise from a chain reactor fart.
Herbie thinks he's so cool, sitting there staring at his monitor, pretending to be working, all the while the ass crickets singing in his pants.
by Tunmy AuGratin February 23, 2006
 
4.
Someone who is quiet and not noticed, but always around. They are not wanted and no one knows who they are. They are irritating like a cricket because they don't talk and you can't get rid of them

And its so ridiculous because these asscrickets are used to replace awesome people who happen to have the same name, but it doesn't work and the person who tried to replace someone with the asscricket is a faggot.
P: "Who is that?"
F: "I dunno... I don't even know who she came with."
P: "She's always over, I don't know her. I don't want her in my house. You can't come to MY house and not talk to ANYONE and still be allowed to be here..."
A: "You guy's talking about that asscricket? That's Jacey."
by #2 Snatchley Mc Flashley March 19, 2007
 
5.
Someone who is always around and no one knows why because no one knows them. This someone doesn't talk ever. This person is a nuisance, like a cricket, because they will not go away.

P: "Who's that?"
J: "I don't know"
P: "She is ALWAYS around! How does no one know who she is?!"
A: "That asscricket is Ashley."
by Business Associate #2 March 09, 2007
 
6.
A small, short squicky fart.
Wait was that an asscricket I just heard? They are rare and elusive you know!
by fotog July 21, 2011