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The action of acting like you're really about 70 years old at heart. Usually associated with people who wear cardigans with elbow patches and bow ties on a Tuesday.
Gellering can also be the use of vocabulary which has not been heard since 1910.
"Gosh, that game was a real humdinger."
"Dude, stop gellering."

"Did you see that tie? It was about three feet wide!"
"I know! He was gellering so hard."
by hairluver September 17, 2014
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