Brown Nosing
Meaning
To be excessively attentive and overly nice in an attempt to ingratiate oneself with a superior.
Example
He got the promotion by driving his boss to the airport, running errands and general brown-nosing.
Origin
The term Brown nosing is a more highly evolved and humorous way of saying kissing ass or butt kissing. Suitable for use in polite company. Someone literally kissing ass could potentially get a brown nose.