That must have been one hell of a stag do!
Seriously, though, I think the phrase is missing a word:
I peed in a horse box once.
thx, you two.
i'm afraid i still don't get it what exactly it means and when to use it.
i've just checked this one ' i peed in a horse once' NOT ' ... horse box' on google once again. i can find heaps of it on comments as it is. they are mostly appeard as a comment.
just in case, i put the url below
'American Idol': Crystal Bowersox returns, judges 'See the Light' - From Inside the Box - Zap2it
hope you guys can give me more details
thx a bunch :-o