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1.
A male with an uncanny knack for attracting attractive, desirable women.
opp: vermin magnet
With his fan club of catwalk models, Peter is a real fanny magnet.

by Big Simes January 22, 2003
 
2.
A sports car that attracts young ladies.
That car of yours is a real fanny magnet!
by Tom_NZ March 27, 2007
 
3.
An older homosexual who is attractive to young gays. From the American slang word for ass - the 'fanny'.
Gerry had silver hair and a tight pair of speedos. He was a real Fanny Magnet
by Columbo gets It Wrong March 03, 2009