brownnose

One who sucks up; a bootlicker, ass-kisser, sycophant.

A workmate reported the matter, "which is why the worker threatened to beat up the latter," calling him a "brownnose" and threatening to "wipe the floor with him."

'I know, he's a natural brownnose. I guess he does have some talents.'

To flatter someone (especially a superior) in an obsequious manner, and to support their every opinion.