be buddy-buddy

To be overly or obnoxiously friendly with someone, often for personal gain. He's clearly trying to be buddy-buddy with the teacher so that she'll give him extra credit. The new guy needs to calm down and stop trying so hard to be buddy-buddy with us. That jerk is all buddy-buddy with people in the office—until they walk away, and he starts complaining about them.

See also:

buddybuddy
buddy
buddy-buddy
buddy up to (someone)
buddy up to someone
buddy up
buddy up with (someone)
buddy up with someone
good buddy
have (got) (someone's) back

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