A semi-erect penis; stemming from the common slang "wood" or "woodie" for a fully erect penis and the fact that balsa wood is a "soft" wood.
"That Victoria's Secret catalog made me balsa."

"'Are you hard, yet?' 'No, but I'm balsa.'"
by Shawn G. November 07, 2007
The area on a man between the testicles and anus
After a long run, Jansen's balsas really stank
by bobbleian April 16, 2008
When you dip your nutsack in salsa and make your lady lick it off.
Last night we wanted to spice things up so my lady ate some balsa.
balls sack lick salsa tongue
by ilovecats12 February 06, 2014
Wood from the tree ochroma lagopus. Light wood that easily foats and is breakable. Wood used for modelling. A piece of balsa: A useless item liable to break. Not well constructed. cf "pants, a pile of"
"That car's a piece of balsa" and "You can make a model out of that!" (ie. it's balsa) as fearured on an Alexei Sayle recording: "Hello John Got a New Motor?"
by R. Clayton Jr November 29, 2005
can be used instead of saying balls.
Ahh fuck dude that bail owned my balsa
by fagz0r March 26, 2005

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