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'Everyone knows that!', 3 letters
'I already know that!', 3 letters
'Isn't that obvious?!', 3 letters
'That was stupid of me!', 3 letters
'Well, how obvious!', 3 letters
'Well, that's obvious!', 3 letters
Answer to a stupid question, 3 letters
Any fool knows that!, 3 letters
Any idiot knows that!, 3 letters
Bonehead's response, 3 letters
Brow-slapper's syllable, 3 letters
Comment made while slapping the forehead, 3 letters
Doltish interjection, 3 letters
Everybody knows that!, 3 letters
Forehead slapper's comment, 3 letters
Forehead slapper's exclamation, 3 letters
Forehead-slapper's cry, 3 letters
Forehead-slapper's syllable, 3 letters
Head-slapping utterance, 3 letters
How could I be so dumb?, 3 letters
How could I be so stupid?, 3 letters
How could I have been so stupid?, 3 letters
How could I miss that?!, 3 letters
How forgetful of me!, 3 letters
I can't believe I blew that!, 3 letters
I coulda thought of that!, 3 letters
I should have known that, 3 letters
I should've known that!, 3 letters
I should've seen that!, 3 letters
I should've thought of that!, 3 letters
I'm not stupid, y'know, 3 letters
Like I didn't know that !, 3 letters
Like, could it be more obvious?, 3 letters
Like, how did I make THAT mistake?, 3 letters
No kidding, stupid!, 3 letters
Now THAT'S a stupid question!, 3 letters
Of course I knew that!, 3 letters
Of course, blockhead!, 3 letters
Of course! in teenspeak, 3 letters
Okay, I get it already, 3 letters
Response to the obvious, 3 letters
Sarcastic acknowledgment, 3 letters
Self-deprecating utterance, 3 letters
Simpleton's utterance, 3 letters
Sound of one hand slapping?, 3 letters
Tell me something I don't know!, 3 letters
That much was obvious, 3 letters
That was foolish of me!, 3 letters
That was silly of me!, 3 letters
That wasn't smart of me!, 3 letters
That's not much of a revelation!, 3 letters
That's obvious, stupid!, 3 letters
That's obvious! in teen talk, 3 letters
Well, that was a no-brainer!, 3 letters
Well, that's completely obvious!, 3 letters
What an idiot I am!, 3 letters
What do you think I am, stupid?, 3 letters
Who doesn't know that?, 3 letters
Word accompanying a head slap, 3 letters
Word with a head slap, 3 letters
You didn't know that?, 3 letters
You might say it when you get this answer, 3 letters
Comments from the dimwitted, 4 letters
Cries from the momentarily stupid, 4 letters
Evidence of density?, 4 letters
Exclamations of denseness, 4 letters
Forehead-slappers' cries, 4 letters
Head slappers' cries, 4 letters
I'm so thick! syllables, 4 letters
Interjections from the obtuse, 4 letters
Reactions to no-brainers, 4 letters
Responses to the obvious, 4 letters
Sarcastic rejoinders, 4 letters
Sounds of denseness, 4 letters