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The sense of aroggance and style shown when attempting a social climbing feat
"See him? he thinks he's pure gallus"
by m0r1arty May 27, 2005
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used to describe a person who is extremely galling.

If you see this person, do not think twice about smacking them across the face....or they will spread their gallu-ness and infect the world
OMG, that gallu saw us. DO NOT talk to it.
by john preston horner June 21, 2010
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