In reply to MonkeyPuzzle:
Necky - a tad on the scary canary side of things.
Udging - not using any technique in particular but gaining ground millimetre by millimetre (chimney's and off widths usually).
Offwidth - a crack that nothing fits properly which is overcome with much swearing and body jams :O) (some people love'em).
Thumb sprag - using the opposing force of your thumb.
gaston - Hard to explain !
Lob - a fall (usually involuntary)
Monster - a strong climber.
sandbag - a climb which is way harder than the grading suggests.
Highball - high routes done over a few mats for protection and the rope left behind.
Shelf shuffling - trad climbing ;O)