A gradual building of applause, usually starting with one person clapping slowly, and ending with an enthusiastic standing ovation. Generally shows approval for an underdog in a come from behind victory or after losing with pride intact.
After they hoisted their broken sled to their shoulders, the jamaican bob-sledders slowly walked towards the finish line. Much to their surprise, the dick-head East German began the slow clap. Soon, the whole crowd was riotously cheering them on.
Evenly spaced applause from a single individual, typically used to call attention to the clapper's presence rather than as a genuine accolade. A classic maneuver for any Samuel Jackson character.
Hero: <impressive display of prowess>
Observer: <slow clap>
Observer: Very impressive, but you forgot about X...
Camera reveals X
An insult. Used to offend or make fun of.
That prick gave me the dreaded slow clap as I walked by him.
Sacastic clap, often becomes a standing ovation. See golf clap
After the guy finished his speach he was sweating like a pig. To really rub it in we gave him a slow clap. When he finally got it over with he got a standing ovation.