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"
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"