This is the act of being skinny and fat at the same time, or being skinny but out of shape. Someone with skinny extremities who also has a beer gut would qualify as finny.
"That chick looked hot from here, but when we got closer we realized she was just finny."
"Check out the finny dude with his beer gut."
1 : provided with or characterized by fins
2 : relating to or being fish
its pronunciation--- fi-ne
nemo is finny
when an individual tries to be a ginny/guido or guidette (italian) and is just making a fool of his or her self
Craig: do u see that dude over there?
Dan: yeah. what is he doing? it looks like he is tryin to be a dude from that jersey shore show
Craig: agreed but hes not italian hes just a finny
Dan: a finny?
Craig: yes a fake ginny