Crimson grenade

The act of taking out one's tampon and flinging it at one person or a crowd of people with the intention of:
1) transferring any blood-borne diseases the thrower currently has

2)disgusting those in the blast radius of the grenade to the point that they vacate the landing site.

When Emily realized the line at the grocery store was too long, she lobbed a crimson grenade toward the crowd; clearing out the rest of the customers and allowing her to advance to the front of the line.