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1.
Term used when someone texts you twice on your smartphone BEFORE you text them back.
More common than the elusive triple grey, that holy grail of male-female interaction.
"He text me last night, I didn't reply, so he text again this morning! I know, total grey-grey situation!"

"He replied with just a smiley face?! In that case, you can't reply, you have to hang on in there for the grey-grey! Then you know he's interested..."
by PatientLady January 22, 2013
 
2.
A Whitney Houston size line of a mixture or cocaine and cement.
Whats that shit hanging from your nose

oh i was doing grey grey all fuckin night.
by ddddbbbb January 26, 2011