Flanker 

In rugby: the name given to players numbered 6-7. These individuals are well known to be gentlemen off the pitch, but as soon as they step onto the pitch they become animals, tackling anyone who comes near them, and often starting fights.

'look at that tackle' 'he must be the flanker'
'any idea who started the fight?' 'probably the flanker'

Flanker by Blind-side April 23, 2018

flunked

having to repeat a grade because of failing

nahh man im supposed to be in the 11th grade ... i flunked 2nd.

flunked by tsunamii.d May 5, 2018

Flonked Out 

When someone gets punked down to do something for somebody they are flonked out

Man he made that boy tie his shoes he flonked out

Flonked Out by Baton rouge slang mane July 27, 2019

flaked 

to decide to "bail" or leave at the last minute

dude he totally flaked
he flaked out on us

flaked by one cool bitch February 24, 2006

Flaked 

Irish slang for being too tired to do anything.

Similar to flaking out where the person flaking would bail from a planned event, flaked is if the person never even accepts going in the first place.

Can also be used to describe you being in comfort
"I went to bed flaked, got some decent sleep."

"You coming out man?"
"Nah I'm too fuckin flaked right now, can't be arsed"

Flaked by Lolzar January 29, 2019

flankenstein 

A name given to a FPS gamer who constantly flanks to get kills

"So I was playing COD yesterday and some flankenstein came up from behind and shot me"

flankenstein by snen😆 August 3, 2016

Getting Franked 

When your significant other gets a hot dog/sausage off the stove and sneaks up behind you and slides it up your butthole.

Mr. Rocha was making hot dogs and didn't realize he was getting Franked by Jasmine until the thumb.

Getting Franked by Hammerhead250 November 1, 2020