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When a guy has an erection with so much blood flow that it literally feels like his penis is about to explode. It is generally quite painful.
"The pain of grenade dick makes it much more difficult to conceal my hard-on than a typical erection."
When a girl gives you such bad blue balls, that the semen backs up, thereforeaking your dick and balls explode
After that sloppy HJ last night, I woke up with a ticking dick grenade.