godan verb (-ru), transitive verb
look down on; treat with contempt; mock; make light of
Strongly derogatory and colloquial; implies active contempt or disdain, often with a sense of underestimating someone.
あいつは俺を舐め腐ってるな。
That guy is really looking down on me.
舐め腐った態度を取るな。
Don't take such a contemptuous attitude.
godan verb (-ru), transitive verb
be cheeky; be impudent; be insolent
Describes a person's insolent or cheeky behavior; often used when someone acts too boldly or disrespectfully.
後輩が舐め腐った口をきく。
The junior talks back cheekily.