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to back out, to wimp out, to pull out, to skank, to not do something for whatever reason
me: couldnt she be bothered to drive?
you: dont know, she just flapped it;

he was going to fight with next man down the pub, but flapped it and ran off;
flapped by Majic Mayhem July 21, 2006
When you fail at something or something goes wrong, used mainly in the North West of England.

Can be exaggerated to flapped everywhere.
Example 1:

Dave: "Can I roll a joint?"

Tom: "Nah, you're just gonna flap it like last time"

Example 2:

Jay: "I was trying to get into that girl but her fella came over and I flapped it everywhere"
Flapped by FlappedJoint June 3, 2012
when you're queuing for a game of cs and your mate flaps the queue
ffs flappa we got flapped again!
flapped by Sahmed! November 10, 2018
My sunglasses got knocked off my face when she flapped me.
flapped by flapped&wounded June 1, 2011
you are super high and you just had sex
guy 1: yo i’m flapped
guy2: nice! was the sex good?
flapped by fuck me joe December 2, 2019