(slang, hyperbole) An unspecified large number (of).
There were about a gabillion people there, mostly teens, screaming and carrying on like he was the biggest star in the world.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.