When your grinding on your downhill skateboard and you get a massive engorged boner. This is usually shameful and people try to hid their skater boner even though they should be proud of it.
Max: Did you hear about what happened to Joey yesterday?
Lucas: What?
Max: He was shredding on his skateboard and got a skater boner.
Lucas: What?
Max: He was shredding on his skateboard and got a skater boner.
by kankz_69 May 22, 2017