Doofish

Adjective. Describing a moment or action that is silly, foolish, or just plain ridiculous; as a result of a lapse in judgment or common sense. Synonyms: goofy, ditzy, airheaded.

"I sent an email to my boss with the subject line 'Hey Boo' instead of 'Hey Bob'—so doofish!"

"I tried to do a backflip off the diving board, but ended up belly-flopping into the pool—definitely a doofish move."

"I wanted to impress my crush by speaking French, but instead of saying 'Je t'aime' (I love you), I said 'J'aime le fromage' (I love cheese)—tellement doofish!"