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2.
A bikini for fat birds with beer bellies or similar wobbly guts.
"Look at her, she'd look like she was a piece of cheese being cut with a wire if she wore a bikini......"

"Yeah dude, thank God for tankinis!"
by BBW Lover February 19, 2005
 
1.
Noun. A swimsuit for women consisting of a bikini bottom and a tanktop top.
She brough her tankini and sunscreen to the beach.
by jlove April 01, 2005