HANG GLIDING
NOUNS
1977 ► SINK in hang gliding: falling air that increases the speed of descent → US sl.
NOUNS, PERSON
1978 ► WHUFFO → WUFFO in hang gliding and parachuting: anyone other than a fellow expert → US sl.
VERBS
1992 ► NAIL THE CORE gliding: to find the centre of a thermal and ride it up → US sl.
Lexicophilia 