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1.
A group text message
My iPhone kept buzzing from new messages in the grext.

Grexting is so much better than texting.
by lolcatz12 December 25, 2011
 
2.
A group text. Often you don't know that the text you received went out to a group of people and you respond without knowing that a lot of people will receive it.
I got a text from someone yesterday and I responded that I thought another guy was being an ass. I didn't know it was a Grext and it turns out that guy was on it. Looks like I'm the ass now.
by CooCoo 4 Coco Puffs February 04, 2013