Top definition
Unable to reply to text messages.
(Adam) "I just sent Trig a message and he didn't reply"
(Adrian) "Ohh is he Doing A Gemma?"
(Adam) "I guess so, that's shabba"
by Spad_The_Impaler November 21, 2014
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2
An overweight Australian Sailor Moon looking person.
That jumpers too bright, and you've colour co-ordinated everything your wearing, and your hair is in pigtail buns. Your so doingaGEMMA.
by Annon1312 May 01, 2006
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