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1.
1. When you blaze too much, and lose control of your penis. 2. Getting too horny and high at the same time, and popping some massive chub.
Fucking oath, someone take the bong away from Wyatt, he's sporting a killer weed-boner
by scagster February 04, 2005
 
2.
To enjoy marijuana that is so amazing it stimulates your mind and sexual organs thus resulting in a weed boner.
"dude!!! That shit smells so good, it gave me a weed boner!"
by bdosred December 14, 2011