1. One who has a nice, curvy figure, or thick ass.
2. Can sometimes relay to personality when someone is not physically thick, but mentally thick.
1. Have you met that girl Deyzha? She's a thickie fershure!
2. Javier: Jackie is a thickie fersure!
Alyssa: But isn't she really slim?
Javier: Yeah, but have you met her?
Alyssa: Oh yeah, she's a thickie fershure!