Finning is when a person excessively gets mad over a simple subject. It usually results in the throwing or tipping over of the nearest object.
The word and definition is derived from "Fin", a nickname of school mate that would get mad over the simplest thing and go completely nuts for about ten seconds.
Danna and Cristian are at lunch.
Danna: Cristian, you are so stupid!
Cristian: (breathing heavily)
WHAT? DID YOU JUST CALL ME STUPID?!
*picks up banana and throws it at Danna*
Danna: OMG! Cristian, stop finning!
Finning is the act of sticking a finn shaped object into the female genitalia and then wiggling or flopping around like a finn normally would. This can be accomplished by making your hand into the shape of a finn, or using an actual finn of some type, which is much more rare. Either way, this is a legendary move that will surely change the girl's life forever.
Finning is the act of inserting one's nose into the female genitalia and inhaling deeply, resulting in the snorting of the vaginal fluid with the end result of gargling and swallowing.