Achronym of: General Impression of Size and Shape. ie: How you recognise a familiar person from a distance from their size and shape.
Hey man, look at that guy over there, swinging his hips and tossing his hair. He looks like my mate Jake, i can tell from his 'Giss'. His 'Giss' looks familiar.
by MikYahRose May 23, 2009
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To bust a nut on yourself.
She was so hot, I gissed in my pants!
by Kool Beanz May 18, 2009
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Guy of the western region of the country, normally with a pussylooking scar on his/her knee and weights about the same as a pricewinning GRANDsized baconator.
Also highly obsessed with childrens teeth, although every child gets frightened by the look of his/her face.
Dude1: Dude, did you see the waves out there today?

Dude2: Yeah dude, Gisse Gris must have farted while scoobadiving, man!
by sharkyshark December 19, 2010
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GISS is a symbolism for 'gone in sixty seconds'. This can be used in the context of sex when a man ejaculates in under sixty seconds, leaving the female to feel 'unsatisfied'
'Oh my god! I finally slept with that guy, you'll never guess what happened?! GISS!!!'
by Jane Harding December 5, 2017
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Gone In Sixty Seconds (GISS)
Using the toilet for a 'number 2' in under 60 seconds.
"Watch this, I'm going to do a GISS."

"Wow, That was an Incredible GISS!"
by Jimmy. Brother of Timmy October 5, 2023
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