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8.
When a man wears no underwear under his clothes.
Angus was freebirding it under his kilt
by lulu2 February 01, 2006
 
9.
when a man pees, preferably into a conventional toilet bowl but alternatively a urinal, while victoriously waving his clenched fists over his head, as tribute to the pleasure of manhood.
Though it started as a fight, we soon realized that warm feeling was neither blood nor sweat--but freebirding. Also, we're gay.
by Sirblondie June 21, 2009
 
10.
Covering yourself with fecal matter and seamen, naked, and playing "Free Bird" by Lynard Skynard on an out-of-tune guitar.
Yeah, man I love freebirding.
by Octavio Hermendez December 07, 2006