the "sup" nod

A nod usually signifying a greeting or the "what's up" as you may. The "sup" nod is usually used for "lax" brahs or other brahs that are too lazy to give daps to each other or don't feel like talking. Another use of this is to avoid the awkward daps and miss, or to avoid attention so that people don't see you associating with that person. Usually used during the winter months because everyone is a zombie in the morning at school. The nod is usually upwards.

Noun or verb depending on how it's used
The Sup Nod is the sudden up-down movement you make with your head when you see someone and wish to greet them, as if to say "Sup."
You can say "Sup" or "Wassup" or "Hey" as you do it.
You do not necessarily need to know the person to which you are giving the Sup Nod to. It's just a way to say hey.
The Sup Nod can also be used when you catch someone looking at you and you want them to stop.
Some use it as a way to let the shawties know you lookin

a nod that gives encouragement and/or utter embarassment to the recipient. these nods orientated from ancient indian folk-law and may be used for any occassion. The "can i have your number nod" and the "i really don't care about the troubles in your life nod" are seen to be the most popular of this kind.