When a man gets an erection because he is either thinking about or currently enjoying multiple manly things at once.
Manly things may include, but are not limited to: beer, boxing,
hot wings, UFC,
jack daniels,
pornographic material, (fantasy) football, full-contact football, meaty subs measured in foot increments, anything flannel, boobs, dip, shit and fart jokes.
Bro 1: I wonder what they'll show tomorrow night at the bar, there's a UFC and boxing PPV at the same time.
Bro 2: Damn. They should play both, then sprinkle porn on a couple TVs, too.
Bro 1: Amazing, then think
about all the wings and beer we'll have...maybe
pack a lip, too?
Bro 2: I'm getting a manrection just
thinking about it.