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Transsexual, also known as 'ladyboys' in Thailand. Geezoids are mostly nocturnal and often answer to the name 'Dave'.
"Crikey! that bird over there is gorgeous"

"Don't be daft, that's a geezoid"
by Ed Bosh July 28, 2008
A ladyboy, transexxual or shemale.
"Jeez Mick, have you seen the arse on that girl over there? She's a real beauty"

"You've had far too much to drink Ed, that's a geezoid"

by Ed Bosh August 18, 2008