To shut someone up by making them look like a dumbass. Mainly, when a person believes’s they are right about a certain thing but, are in fact wrong. For example they believe a (i.e. Person made a certain song) but it fact it is a totally different person so they are proved wrong and humiliated in front of a crowd. It is normally proclaimed by one of the on lookers if they believe the diss is worthy of the recognition.
1. Person 1: "I dont care what you say, drinking everyday is better then smoking weed every day for your body."
Person 2: "Your a fucking moron you obviously believe everything D.A.R.E taught you!"
Crowd: "Ahahahahahahahahah"
Person 3: "Smack-down"
by [J.C] October 28, 2005

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The factually accurate and brutally delivered written or verbal retort due to all smactivists.
Glenn Beck needs a serious smackdown for being a world class smacktivist.
by Nosmack August 30, 2010

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You say it when you've bested someone at anything. Like if you win a card game, beat someone at a video game, or a race, etc.
*You beat someone in Fight Night Round 3*

Yeeaaah boy! SmackDown! F*ck 'outta here, you can't beat me!
by Sendo August 01, 2007

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The WWE show, shown on Thursday nights, which carries the substandard WWE wrestlers. Is the competition for WWE RAW, which is the authority of WWE TV shows. Their titles are the WWE Championship, WWE Tag Team Championships, and the Cruiserweight Championship.
Damn, no wonder he's not on RAW; SmackDown's the only suitable place for his suckiness.
by Dodd December 06, 2003

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The sic shit on UPN that no onther show can fuck with not even weak ass over dramatic raw.
oh shit dude Smackdown's fuck that RAW shit
by Opeth February 05, 2004

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Smackdown vs RAW, a game played primarilly by horny young boys. Or at least that's what the developers believe, since many potential game modes were left out in order to have online-capable "bra and panty" matches.
"EXCUSE ME?! SOMEONE CALL NINE ONE ONE!!!! The only place you see carnage like this is on SMACKDOWN(tm)!"

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When you smack, and then someone falls down.
Let's lay the smackdown
by JoshDizzle June 11, 2007

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