A subsitute for 'y'know, often heard in jails or prison uttered by uneducated inmates during conversation between cells. Can be used to validate the statement by the user, or to clarify that the statement was heard by its intended recipient, often a fellow illiterate. Used by middle class white kids to sound hip but usually comes off sounding extremely pathetic and requiring a beat down.
Inmate Rashid: Yo M-Tee, I boofed an eight ball on my visit with my girl, you heard?
Imate M-Tee: C'mon man, stop playin'..word?
Inmate Rashid: Word, I'm ready to bust one out, you heard?
Inmate M-Tee: Word son, I gotch you.