A boner is a mistep, a faux pas, one making a total ass out of oneself. You know, like that clown in the White House and everything that comes out of his flapping jaws and fat little twitter fingers?
No joke. That's a true boner. Enough hate. It is Christmas before Eve and I need to listen to the Mormon Tabernacle Choir and make cookies.
OMG I looked it up and your right! It means to make a mistake, not crack a joke. Yikes, how embarrassing. I really made a big boner this time didnt I? ;+
It's an expression only a guy can use when he unexpectedly encounters a rather beautiful scantily clad women and nature has had a rather instant reaction for him and he's able to stand out in a crowd and point to things without using his hands..... ;)D