what "doubled-up" means?

所有跟帖： 

• doubled-up in someone else's apt - meaning sharing apt? -evil- ♀ (0 bytes) () 10/31/2006 postreply 18:23:35

• kao, 有没有人知道上面是对不对 -evil- ♀ (0 bytes) () 10/31/2006 postreply 18:38:18

• 差不多吧，至少我这样认为。 -无ID- ♂ (52 bytes) () 10/31/2006 postreply 19:00:52

• In poker playing -gingergirl- ♀ (68 bytes) () 10/31/2006 postreply 19:08:44