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
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