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2.
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
 
1.
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
 
3.
Buzzing, sounding good, a good time, shit hot
Man, your pipes are gallus.

That was a gallus night out.
by Gallusman July 26, 2010