smackdown 
noun informal, chiefly US
1A bitter contest or confrontation: the famously crusty Democrat had a series of smackdowns with the Governor...
- Like an old ethnography, the film's musical smackdowns are rich in cultural and racial stereotypes: Mexicans play a mariachi, Africans beat drums, a Thai man plays a mournful oriental flute.
- With no alternative, she learns to fight and confronts him for the final smackdown.
- I want to tell you one thing: I'll take you Times Square later and lay the smackdown on you.
2A decisive or humiliating defeat or setback.His tongue-in-cheek lyrics and sex-drenched growling vocals, gave a huge smackdown to the critics and music industry tools blatant ignorance of indie bands....
- Luckily he didn't have a witty pun to throw into the mix for this contestant or I may have lain the smackdown on the television.
- As it happens, one of these smackdowns came on the newspaper's editorial page website.
Origin
1990s: from smack1.