A boner that is achieved by thinking of forbidden thoughts. The owner, of said boner, must always make his best efforts to not let his friends know the root of his erection
“That fella Jack’s got a boner”
“I swear I’m not thinking about my sister”
“Aha, Jack’s got a Prague Boner”
When you’re eating something with a stick; like a lollipop but you keep your mask on. So you’re mask is bulging making it not only look like you have a mask boner, but it also takes away the purpose of the mask because now your air is ventilating through the bottom of the mask.
Kristen: OMG! Do you have a mask boner?!
Mark: What’s that?
Kristen: When you have a stick in your mask making it look like your mouth has an erection.