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1.
Has any of 3 meanings:

1. When someone is observing another's actions. Usually when they are doing something that requires attention.

2. Can alternatively mean 'I understand you'

3. Can also be used sarcasticly when invading someones personal space.
example 1:
person1: bro what u doing?
person2: im sniffin u cuz

example 2:

person 1: bro u know how we got together with the boys and went out
person2: yer bro im sniffin u cuz

example 3:

person1: ay wtf u doing so close to me?
person 2:im sniffin u cuz
by Markwick October 05, 2009

Words related to sniffin u cuz

bro ay cheese cuz cuzzi smell smelling sniffin sniffing the boys u wtf yer you