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2.
An often used phrase in the North West of England, it refers to anything that is old, redundant, slow, or obselete. A Lusitano Nag can be an item that is no longer up to date, an idea that is no longer valid or a person who has done something irrevocably stupid.

The phrase originates from the horse breed, Lusitano. The Lusitano is considered one of the best breeds in the world, but once old, like a car or aging prostitute, its value decreases rapidly before it is thrown to the knackers yard.
'Why did you eat my dinner, you Lusitano Nag?' - Said to a person who has eaten another's dinner.

'Come on, start you Lusitano Nag!' - Said by a person attempting to start their banger on a cold wintry day.
by Lance Inferno June 01, 2010
 
1.
This is a horse, who is really bad at racing or anything else pretty much, even though it is entered for so many races and other events you would think it was about to give up and become a politician.

It is also the kind of persistent appeal for approval that certain people make, and that other people get real tired of real quick.
12:04 and 25 seconds:

An9ialist: Where's my definition? Who rejected zziadfuoqpoir?
Harriet23blonk: huh?

12:05 and 15 seconds:
An9ialist: Who rejected my zziadfuoqpoir definition? Come on!
CharlieTheFrong99ish: God, don't be such a Lusitano nag. Get a life!

12:07 and 37 seconds:
An9ialist: Who rejected my zziadfuoqpoir definition? Some idiot did it, who?
UD: SMACK!
by notalongtimetodo June 01, 2010