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"
to go work out or enlarge your muscles
oh where were you?
i was at the gym swelling :)