can be used instead of saying balls.
Ahh fuck dude that bail owned my balsa
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.'"
The area on a man between the testicles and anus
After a long run, Jansen's balsas really stank
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?"