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1.
Can be used in a varitey of contexts:

1. As a term of disappointment similar to the word lame.

2. As an insult, similar to the word "idiot" or "berk".

3. As a verb, that means you're going to do something, what that something is, is left for you to elaborate on.
1. "Hey dude I lost my phone in a canal last night when I was pissed"
Reply: "flerge"

2. Dude, I can't believe you puked up on my bed you fricking flerge"

3. "Im gonna flerge you"

or

"I flerged your mum last night and it was well lolcats"
by Caz26 May 15, 2009