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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
Gluten free multigrain cracker. From the Greco romain word flackus which means to vomit after a small meal.
"Those flackers aren't actually edible", exclaimed Jon as he spits out his bourbon.
Flacker by Papabear November 12, 2016
A person who bails out on a commitment at the very last minute.
Tim is such a flaker. I can't believe that he bailed out the very last minute! I'm definitely not inviting him to hang out next time.
flaker by Zain Cheng February 17, 2006

belly flaker 

A man who masterbates on his stomach and fails to clean himself.
belly flaker by Lou R August 28, 2006
Someone who does not show up when they had previously stated they will. Also, someone who has no intention of showing up, but acts like they will or want to show up only to mess with your feelings.
Simona is a flaker, she said she wanted to catch the game, but she met up with her real friends instead.
Flaker by Oppa's Club May 1, 2012

bare bum flaker

The act of releasing anal gas with no underwear on, with such pressure that any residue (poo flakes) left behind on the anus after poo-ing are released into the air.
"I let rip a massive bare bum flaker getting up this morning, you could almost chew the air!"

"I got the bitch back last night by bare bum flaking her in the face while she slept"