When a person no one likes enters a conversation, therefore making it awkward, a douche grenade
has been dropped. Named because the person's comments affect
everyone in the group, like shrapnel from a grenade
Bob: Did you see Shaun White's Double McTwist last night
Mark: Yeah, man. That shit
Tom (Friend no one likes): Yo, Louie Vito's better, he just had a rough night
Bob: Who just dropped the douche grenade?