Camp as tits.
Debbie just used a brilliant one on Shameless: 'Don't piss on my leg and tell me it's raining!'
Happier than a pig in sh*t
this is offensive, so apologies, but when i first heard the term:
"...useless as a bunch of retards trying to f*** a doorknob..."
- oh, it did tickle me. and yes, im going to hell. sorry.