This is an old fashioned way of simply saying that somebody is lying. Most of the time, the liar is really trying to convince the person of that lie. The lie may be repeated, the liar may argue, and even tell more lies to reinforce the original lie. Beating somebody down to a lie can also be expressed as beating somebody down to a pack of lies, when several different lies are told.
He beat me down to a lie. He said he hadn't been drinking and the whole time he smelled of alcohol so strong you wouldn't believe it. It's really sick how he can be beating somebody down to a lie like he does. I think he has himself convinced he's telling the truth.
by mama'sfamilynut1983 September 23, 2013
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Meaning is hittin it from behind and clappin them cheeks. Gets its name for resembling sand dunes, hence you beat the dunnies down.
Splez: Ayo treesh lemme beat the dunnies down!!!

Treesh: Okay daddy you can get all the ass you want...

Splez: Ight bet. Uh Huhh Huhhh
by Cex Offender April 13, 2021
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beat the dunnies down
Stranger : man I’ll love to beat her dunnies down respectfully

Stranger 2 : what do you mean?
Stranger 1 : you know what I meannnn

Both strangers : oooooohhh
“beat the dunnies down“
by Adamwrld69 March 27, 2021
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Sexual intercourse with a girl who’s ass is large than average.
I can’t hang out tonight I’m beating the doonies down.

Who’s doonies?

Hattie’s
by Bigshmoneydawg May 16, 2021
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Chris Brown's new nickname after he beat up Rihanna.
White Guy: Did you see Rihanna's battered up face after Chris Beat Em Down Brown got to her?
Black Oreo: Yea, he was really mad, dude.
by apimpnamedpernell March 12, 2009
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Someone is beating you in a video game, sport, or some sort of competition and you ain't gonna lose without a fight.
Micheal just went 5-6 in a game he ain't gonna take a beating lyin' down.
by A_Person_Who_Plays_Games October 24, 2020
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