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1.
For those not living in London this is basically a way of telling somebody to improve something of theirs, normally coupled with 'look sharp' after the song released by Dizzee Rasscal
Fix up, look sharp

or

Fix up your hair

etc etc
by Hugh Janus September 16, 2004
 
2.
used to tell someone to improve their shit
person 1: i aint got that MC Pitman CD yet yer ner..
person 2: you need to fix up and get it, its a heavy CD
by Vinyl Scientist October 10, 2003
 
3.
Fix Up

"Fix{ed} {ing} up" is a phrase from Toronto, which has several general meanings including:

1. a particular instance of personally encountering, undergoing, or preparing for a pleasurable or enjoyable event/occurrence;

2. encouraging an ambivalent individual to participate in a particular action or behaviour that is expected to yield frivolous enjoyment or gratification
1. Jeff: Did you fuck with that chick last night?

Mike: Oh ya...I "fixed up"!

2. Stephen: I really don't want to go to Beerfest this year.

Sheldon: C'mon, fix up, its my birthday!
by Ratche July 08, 2011