Soup Grenade 

Explosive diarrhea.

omg, I think I am going to have Mexican soup grenades from eating at Taco Bell..

Soup Grenade by tlay January 22, 2011

grenade soup 

This is when an attractive girl has gained a significant amount of poundage for no explanable reason.

God almighty! That bitch was hot last summer, but she's been eating grenade soup.

grenade soup by Jon Downey September 25, 2006