that's funny 

Saying this with a straight face is a polite way of letting you know...its NOT funny.

This occurs after sharing something seemingly funny as the listener responds with a straight face and no vocal inflection.

A:
Next thing I know, the guy vomited all over the train, lucky none got on me, but the best part was his shirt...
It read: "In my life, every day is a disaster..."

B:

That's funny (straight face).

that's funny by T. Polkinghorne February 11, 2010

That's Funny. 

An alternative to actually laughing, can also be accompanied by laughter.
Most annoying when said without the laughter and consistently, and with a strait face.

"And the Rabbi walked into the pole!"
"That's Funny."

That's Funny. by idefyphysics April 1, 2010

That's funny to me 

when something is funny to you or your friends, in which is offensive to others.

Bill: My mom just died.
Tom: thats funny to me

That's funny to me by kiwi May 7, 2004

That's funny because... 

What people do on forums to piss off the original poster by copying there first post as there's. See example. It's best to keep all there spelling mistakes and swear words as a sidenote.

Original poster: ok guys today I was at the playground and I saw this huge fat guy eating a burger. Then I wlked over and was like your fat. It was funny.
Poster2: that's funny because... today I was at the playground and I saw this huge fat guy eating a burger. Then I wlked over and was like your fat. It was funny.

That's funny because... by Lolzatu23467754 August 21, 2009

Haha, that's funny 

Used in real life conversations or IM meaning, "I'm pretending that's funny, but it's really not" or, "I have not idea/I don't care what you just said, so I'm gonna say this." Also sometimes used with lack of enthusiasm in real life to show sarcasm.

Similar to lol, lolocaust, and haha.

Frank: I just threw an apple at my sister! LOL!
Donnie: Haha, that's funny.

Meaning: What the fuck, you suck at humour.

Joe: So, I said, "No, that's my seat, yours is over there."
Jake: Haha, that's funny.

Meaning: I'm bored, I'm gonna go get high.

Haha, that's funny by Highly Evolved May 25, 2006

dude, that's not funny, my mom's dead 

The ultimate response to the ever classic insult 'Your mom.'

Person A: Hey dude, sup?

Person B: YOUR MOM IS UP!

Person A: Dude, that's not funny, my mom's dead.

Person B now either believes you, is confused/apologetic, or smart enough to prove the ultimate response to this; Yeah? I really like that.

dude, that's not funny, my mom's dead by Ninja-wizard-pimp-ghetto-lowtax-maddox-internet. September 12, 2008

that's not funny 

instant mood killer + awkwardness

Joe: Hey, did you see that cheerleader who suffered from the side effects of the H1N1 vaccine? She was jerking all over the place, I couldn't stop laughing when I saw the video haha

Dave: That's not funny.

Joe: ...

Bill: soo, anyone want another beer...? I'm gonna... go get some beer.

that's not funny by TheGreatDekuTree February 9, 2010