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 !!!!"