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ODE→gak

gak

Flag: gbEnglishOxford Dictionary of English
gak /ɡak / (also gack) informal
▸ noun [mass noun]
1 cocaine.
2 a sticky or messy substance:
the shower failed to remove the gak from my hair.
▸ exclamation used to express distaste or disgust:
Gak! There she is again!.
– ORIGIN 1970s: imitative; the form gak dates from the 1990s.