A term in the Bay area that references the localfootball team (SF 49ers), except it applies to girls who think and act like they are 9s but in reality are just 4s.
Person A: Dang, did you see that girl walking into the restaurant?
Person B: Yeah, she looks super hot. Let's wait for her to turn around!
Person A: Look! She turned around. Oh man... she looks good from the back but not from the front.
Person B: Yeah, she's definitely a 49er!
A 49er is a class of boat used in Olympic sailing events. 49ers are named after the draft, which is 4.9ft. The two sailing events 49ers are used in are the 49er series and the 49erFX series. The 49erFX series is the women's version of the event.
In Athens 2004, Basque sailor Xabier Fernández Gaztañaga won gold for Spain in the 49er series alongside his sailingpartner, Iker Martínez de Lizarduy