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This phrase is an odd variation from the regularly used phrase "that sucks". There are two main definitions of this:

1) in literal terms, putting your mouth to an anus and quickly inhaling, causing a stream of air to be pulled into your mouth from the anus.

2) in slang terms, to be bad. This is how the phrase is most commonly used, and tends to be more intense than the usual "that sucks." "That sucks ass" is like adding a "really" to it.
"She sucks ass!"
"Wait, seriously?"
"Not like that, man"
"Oh..."
by Dirty Shoes January 12, 2005
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suckass a less vulgar less offensive alternative to fuckass when calling someone a fuckass is not appropriate and have to mind your manners
my cussed me out this morning for not coming to work yesterday what a suckass

my neighbors dog crapped on my porch last night and the neighbor refused to clean it up what a suckass
by littlejimmie April 24, 2019
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of such inferior quality as to boggle the mind
This is an aweome song! It's too bad the station sucks ass to the max!
by MM from BB November 11, 2003
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1.) Very geographically limited term for "bad."
2.) Used as an expletive in the areas of #1
"That was suckass."

"SUCKASS!"
by son of stalin February 28, 2003
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