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1.
Constantly looking at your phone while out with friends and/or at a public event, e.g. concert, sporting event, wedding, etc.
The concert was great, but instead of taking time to enjoy the show he had his smart phone out and he was crassing the entire time.
von shebainpdx 16. Juli 2013
 
2.
To be on your phone during a party, conversation, sports event, or other place where it is inappropriate or antisocial.
"Yeah, we all went out to dinner for my birthday but everyone was just crassing."
von djnarnz 9. August 2013