When your jeans are loose and it folds upwards around the crotch area to make it look like you've got a gigantic boner (depending on how loose they are).
Today I wore these new ripped jeans , but they were loose so I walked around with a jean boner all day.
A level of excitement, surpassing the level of stoked, verging towards near sexual arousal. Often associated with surfing, and other boardsports.
"It's 6 foot and glassy offshore at the cove today you coming for a rip?"
"Buddy, I got a huge stoke boner, I'd ruin myself financially for one measly left."
or
"If stoke boner persists for over 6 hours, drink 750ml Mountain Dew Code Red"