A male individual, usually around the age range of 15 to 30, that seeks female legs in order to open them and involve himself in sexual intercourse with that female individual.
The term originated in several message boards across the internet in early 2009. Some synonyms include Casa Nova, Don Juan, womanizer, etc.
Brian: I was expecting Greg to arrive by 11pm tonight, do you know where he is?
George: He is at the club being a leg seeker like he has always been, do you really expect him to come over in such an important task like that?