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2.
1) To be exhausted from a hard days work.
2) Unable to get wood due to excessive knobbing.
3) A gay phrase used by douchebags to try and make them believe they're having more sex than you.
Ben: "Ooooh yeah, after yesterdays exploits, I'm shagged out!"
Kevin: "What, those men tire you?"
by Jamie Douglas September 24, 2006
 
1.
Akin to the word knackered.
Very tired.
I'm shagged out after last night.
by minges and all April 18, 2003