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1.
(Danish expression)

Flyfucking is when a person cares about small silly details that don't really matter in general.
'You've spent all day flyfucking, can you do something meaningfull now?'

or

'I'm in the flyfucking phase of tuning this machinery, polishing up every little crappy detail'
by Fanis8 April 13, 2007
 
2.
When the penis is inserted into the vagina (sexual intercourse) while the trousers are still on with the penis going through the fly.

Used for very fast entry or when in an unusual area such as the park.
He fly fucked her in the corner.

He was so horny he just fly fucked her.

They just did it fly fucking style.
by Wich Chammins October 07, 2008