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Slang for lying; to decieve or beguile. A slang term derived from the DC/MD metro area. Typically used in its progressive present participle: swelling.

-Note it is not common to use in simple form present tense: Swell
"My homeboy has a 92 Geo Prism and said he drove a G35 Infinity...swelling (lying) like sh*t"
by Michanism October 07, 2009
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