Someone who dresses in upscale, expensive clothing, drinks expensive alcohol, treats their partners to a life of luxury, and who also tends to take on a dominant role in a relationship.
The term came into fruition in order to describe a fictional persona for a character from the show "The 100", that is, Fine Stud Lexa.
Damn, Fine Stud Lexa is so damn extra in that suit and with the beautiful Clarke on her arm.