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2.
Verb transitive : To Gasson (it).

To shoot randomly on a pool table when you don't know or can't be bothered to think about what to do - and after making the pot, to convince yourself you did well, despite everyone else in the room calling you a flukey c***.
"What's he doing? he hasn't left himself any shot on the black!"

"Don't worry he'll probably just Gasson it!"

"wait ... wait ... wait ... of for f***'s sake !!!!"
by Pea Dough May 27, 2011
 
1.
To Gasson; The act of playing a pool (or snooker) shot without due care and attention, with the hope that you may glean a reward from said action. Generally unsuccessful, but the success rate is higher than you would imagine possible.
He totally Gassoned the black in off 5 cushions!
by Barry 'Cillit Bang' Scott June 29, 2011