The act of jerking or stroking a mans penis to the point of climax, right before climax is reach the giver punches the receiver in the ball and then punches them in the face. If climax it achieved you have given a successful hand job hand grenade.

A sexual act where Person A defecates into their own hand and throws it at Person B's face

Even though you missed it by a tiny amount, you still didn't get there.

A time when there is no positive effect, or will be no positive effects, because of your actions".

With horseshoes, hand grenades, and nuclear war, you can miss your target, or goal, but still have some positive effect.

When in reverse cowgirl, the man, just before orgasming, reaches through the woman’s legs to grab a fistful of pubes. The man then rips them out while thrusting as hard as possible to launch the woman away, screaming “grenade” and taking cover.

When a girl is on her period and already in a bad mood. So you proceed to turn her on and when you finally get the chance, you pull the rope on her ramping and run as fast as you can.

Someone who shows up and destroys everything they touch.

Robert the Bruce's heart was cut out at his death, he was the true braveheart. His heart was later carried on a crusade to make the crusaders more courageous. It was thrown into a group of opposing soldiers during battle.