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When someone is being lame, maybe a little boring, bitchy, or is in a grumpy mood.
Dad: “I’m going to bed because you guys are being a bunch of crabasses.”

Kid: “Gee thanks.”
Crabasses by BootyYeeter69 February 17, 2019
Related Words
A crabAss is a mood that one has from time to time. It’s unpleasant at times to spend time with someone who is in a crabAss mood. Nothing is appealing or wanted to do by a crabAss. They are easily annoyed. Recommended to be quiet and submissive. Never reply to a crabAss by saying really or the level of crabAss will immediately increase. Waterheads are warned to stay away from ones experiencing a crabAss mood due to their sarcastic nature and joke having at the wrong time personality.
He’s in a crabAss mood so I left to create this definition.
CrabAss by Waterhead N Fireman September 15, 2019
One who is being a complete retard for no apparent reason, also quite similar to asshat.

May also mean one who is a jerk about nothing.
"Damn, Steve is being a real crabass about his fridge, wouldn't let me get near it"
Crabass by Edward Franklin January 1, 2004

Nebraska crabgrass 

While doing a woman from behind, you reach around and tug on her pubical hair
I gave Ms. F a wicked Nebraska crabgrass last night
Community action with a mob sentiment that ignores reasonable discussion in favor of preconceived notions.

It is the opposite of astroturf, in which organizations create public statements and falsely attribute them to members of the public, or pose as a member of the public when making the statements to give the appearance of grassroots approval or support for the organization or its actions.
That AT&T blocked images from 4chan because of its content may just be crabgrass. That they blocked it only because of a network problem may be astroturf.
Crabgrass by ITBG July 27, 2009

Nebraska crabgrass 

While doing a woman from behind, you reach around and tug on her pubical hair
I gave Ms. F a wicked Nebraska crabgrass last night