It's rude to insinuate that someone defecated in their pants.
Mark is at a party with his friends and the conversation is winding down.
Mark wants to make everyone laugh.
Mark tells a funny childhood story that is fairly innocent.
Mark loudly tells his friend that he smells and asks if he defecated in his pants.
The group all laughs and starts to share their stories, making conversation pick up again.
Mark's friend leaves the party upset and the other friends call Mark a jerk.