chucky

Doing something silly, embarrassing, nonsensical, or without thinking it through.

A person who does stupid things without thought.

A person who only thinks about themself.

When you locked your keys in the car, that was so chucky!

My chucky brother used my toothbrush to clean his bike chain.

That guy is really chucky! He's always late to our meetings and forgets my name even though we've met many times before.