pop a boner
The phenomenon that takes place when a sexually aroused male experiences a sudden or gradual rush of blood to the penis causing it to stand stiff and harden, often occuring unexpectedly in a public setting.
Example:
I always pop a boner every time I see your mom bend over
I popped a boner in Miss Goodbody's math class just before she asked me to solve a problem on the board
I always pop a boner every time I see your mom bend over
I popped a boner in Miss Goodbody's math class just before she asked me to solve a problem on the board