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Short for geriatric – a term relating to senior citizens and a sometimes offensive term meaning very old or too old to be useful or taken seriously.

Normally used to bust someone’s balls who really is just a couple of years older than you. Contextually similar to Alice and can be interchangeably with old fart, and grandpa
Quit being such a freaking Gerry, you aren’t going to break a hip.
by finnadat May 24, 2004
61 110
the worst possible thing one can be.
the type of person that saw the anti-drinking or drugs propaganda videos made in the 50s and takes them seriously
Man did you see that dude, he was such a gerry

Jack's not drinking tonight, he's being a gerry
by pete February 17, 2005
52 127