1)Milli Vanilli.

2)Ashlee Simpson.

3)a version of lip movement in which a recorded version of a song is being played and a self-described "artist" moves their mouth to the words being sung, stimutaneously dancing in a choegraphed fashion.

4)Fake talent. Also known as acid reflux.
1)"Did you hear about that band Milli-Vanilli that was around before you were born? They started the whole lip-syncing trend. apparently it caught on..."

2)She may have acid reflux, but she can sure do a great hoedown.

3)"And here we have Hilary Duff lip-syncing while looking into a mirror, which serves as the rigerous rehersal for her next tour..."

4)"Hey man, she couldn't sing so she had a right to lip sync! It says so in the rules...."
by raquel.w March 23, 2006
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Similar to, but different from, lip syncing as rip syncing is the act of actually singing words, typically at the top of one's lungs when very drunk and having little care for the actual lyrics.
Jim was hammered last night and got rip syncing with Jill the entire Boston album. Between the two of them, they knew about 40% of the lyrics and 100% of the choruses, which the yelled very loudly.
by the comand'r October 26, 2017
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To use the popular online telecommunication application with another friend to sync web pages or videos and view them at the same time; to simulate being with each other in the same room listening to each other's comments, frustrations, laughter, ect.
Dude, my new Youtube video uploaded, Skype Sync?
by compnerd311 June 15, 2009
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To watch a film/Tv programme while talking to a friend who is watching the exact same thing at the exact same time, in a completely different place. This can include television, DVD's or online movies. It is common to use communication devices such as MSN, a telephone or FB chat.
Sync Watching results in you repeating every funny line in the movie or tv programme to your mate and therefore enjoying it, synchronized.
Hey man, wanna Sync Watch The Hangover with me?
by Littlest Of Braiths August 12, 2010
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To move one's lips in synchronization with a recorded speech or song
I can't Believe that she would lip-sync to her own song.
by Light Joker March 21, 2006
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ME: HAVE YOU EVER HEARD OF Study Sync
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by Gucci Gang Gueen January 11, 2019
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