Sharp as a Beach Ball 

Not too bright and certainly not sharp!
Usefully juxtaposed to something really sharp.
The opposite of "sharp as a razor" - clearcut and incisive.

That guy is as sharp as a beach ball - he didn't even realise the girls were teasing him when they fell on the floor laughing! He was well taken in!

Sharp as a Beach Ball by Brian Butterly February 13, 2007

sharp as a spoon 

a person who is not too clever

your as sharp as a spoon

sharp as a spoon by mob January 13, 2004

SHARP Skins

SHARP punks and Skins. The SHARP stands for "Skinheads against racial Prejudice". SHARPS are true punks because thats what punks rock was always about from the beggning,uniting all people despite there differences, and not conforming to the bullshit ways of society, and kicking the shit out of facist racist fuckers with no heart.

Black or White PuNx UNITE!

Nazi idiot fake punk: Hey look at the Mexican he's a Beaner! Look at that Asian he's a Chink! Look at that black guy he's a Nigger!

SHARP Punk: What did you say?

SHARP Punk #2: Yeah, What did you say?

SHARP Punk #3: What did you say little bitch?

SHARP Punk #4: WHAT?!

SHARP Skins: umm, what the fuck dude....

(10 minutes later "Nazi idiot fake punk" ends up in hospital..)

SHARP Skins by Bad Brain August 11, 2008

Sharp Shoot 

To dissect an opposing opinion into little chunks in order to point out irrelevant specifics.

I said "penultimate" when what I meant was "ultimate". You know what I meant. You're sharp shooting my point.

Sharp Shoot by deejay23 December 15, 2011

Sharp Farts 

A super painful stinging fart that feels like a razor cutting through anal flesh as it’s released. Most likely due to out of control hemorrhoids.

“Hey I got tickets to go see ‘Harry Hemorrhoid and the Sharp Farts’!

“Hell yeah! They’ve got that new single out ‘Daddy’s got the Fart Needles Again!’”

Sharp Farts by Chauncey McLoggins September 16, 2021

sharp as an apple

An apple, being spherical and smooth, is one of the least sharp objects one could find. The phrase "sharp as an apple" therefore means that the subject is slow mentally. An idiot. It can also be used in a self-deprecating manner whenever someone comments on your failures, though typically it helps if you don't actually believe you are.

Guy 1: Hey man, what do you think would happen if I stuck my hand in this blender and turned it on?
Guy 2: You really are sharp as an apple, you know that?

sharp as an apple by Turkey Boy February 27, 2008

Sharp’s Lexicon 

To argue in favour of an opinion in a ridiculous manor to the point where the opposition can’t even argue back because your argument was so retarded. This also includes use of logical loopholes.

David-“Thomas used Sharp’s Lexicon the other day when arguing if you could float on water covered in oil.”

Sam-“What a retard”

Sharp’s Lexicon by Akiren November 24, 2020