Internet/IM speak for a laugh and a half, meaning something is mildly amusing. Substitute for a higher fractional number if the situation calls for it (i.e. a laugh and a 0.7).
Person 1: Did you see yesterday's episode of The Daily Show? It really was a laugh and a 0.5.
1. "Are you kidding me?" Typically used in Great Britian.
2. The catchphrase of Andy Millman's (Ricky Gervais) in the tv-show-within-a-tv-show, "When the Whistle Blows". (from Extras.) Spoken in a high pitch and followed by "Is s/he havin' a laff?"
"What would you go for first if you were a piranha?"
"I'd probably just have a bag of crisps."
"Are you having a laugh?"
When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).