Definition 1:
To boost to an extreme level.
Definition 2:
To exagerate beyond belief.
Definition 3:
To tell a lie
Example 1:
DA Boiz: Yo chris you fucked some girl in the club.
Christian: What? Oh yeah! Yeah man. Fuck. Y-y-ooo she was screaming my name so loud everyone cheeered Chris when I came out. Maan I was so drunk on ciroc and grey goose like fuck.
DA Boiz: How was it?
Christian: Yo man like.... It was so great.
DA Boiz: Come on..... Stop Fattuzing.
Chrisi Cmon man, i'm right here.
Example 2:
Lightskin: Hey man I have NBA 2K14.
Corny: Really bahd? When did you get it?
Lightskin: Well I don't actually have it yet... But li...
Corny: FATTUZ!