Troisi is someone who is prone to stalking their friends via face book, google images, and sometimes even urban dictionary. Or could be someone like Patrick Star from Spongebob.
When a girl isn't hot enough to have sex with soley, but when paired with another girl of equal attraction she becomes troisable, or acceptable to have sex with in a threesome.
Trisia is smart, kind, loyal, beautiful girl. Trisia loves her friends and family with all of her heart. Trisia can be your worst enemy when messed with. Trisia is sassy and annoying sometimes but is an overall sweetheart.