reverse brown nosing 

When the person you were previously sucking up to starts brown nosing you; also known as backwards brown nosing.

At first I was sucking up to Felly, but then she started reverse brown nosing me and complimenting me all the time!

reverse brown nosing by erieee January 13, 2010

Reverse brown nosing 

When someone who you used to brown nose starts brown nosing you back.

Remember when the new Vice President was hired and Brady was the biggest brown noser? Now the VP is reverse brown nosing!

Reverse brown nosing by Luke Willis February 12, 2015