If you're annoyed or angry with whoever you're talking to it basically means whatever, just get the hell out of your face, shuttup, and leave you the fuck alone.
If you're not mad it means: Ok, sure I'll go along with that; or I'll do it later.
Can also be used with affection to a loved family member in place of "I love you too," in some cases.
Ex. 1
Teen: (goes downstairs to get a snack and drink)
Grandmother: (limps in with cane) It's your day to clean the kitchen
Teen: (in an indifferent tone) If you say so (goes upstairs with snack and drink and continues to play on computer)
Teen: (thinking to self) I can't stand that bitch, she gets on my fuckin' nerves! She needs to turn on the damn air conditioning cuz it feels like a sauna up in dis bitch!
Grandmother: (downstairs in kitchen)(limping slowly with cane to get a drink)

Ex. 2
(daughter and father finishing a phone conversation)
Daughter: What are we doing when you get off work?
Father: I don't know sweetheart, probably nothing (obviously kidding). I have to go now, I have a customer that I need to get back to. I love you.
Daughter: Daad come on!
Father: I have to go now, I'll call you back later. Bye, I love you, and I'll see you when I get home.
Daughter: If you say so, bye! (hangs up phone and continues to watch TV)
by Qu33n0fH3@rt$ July 20, 2008
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what you saying?
translated to "hi how are you?"

A greeting used by the un-intalectual ones amungst us.
by Abbott1 August 21, 2006
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when an asshole fucks around, you give him the what the fuck are you saying line
(asshole fucks around)

sick guyyy: what are you saying asshole

(asshole continues to fuck around)

sick guyyy 2:seriously what the fuck are you sayingg guyy
by jarridgillchrist May 31, 2011
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An annoying question asked before you actually say anything, which is often ignored. A common failed pick-up line.
by Sam McGee August 12, 2006
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The way to end a argument you know you have been beaten on.
The Rat-Bag might say 'Well you say that but'
by RatKing1925 April 19, 2016
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A song written sang by Lea Michele, which is in her debut album, Louder. “If You Say So” is about Michele’s late boyfriend, Cory Monteith. Her song is about having trouble coping with Monteith’s death. Michele says in her song, “You said, I love you girl/ I said, I love you more/ Then a breath, a pause, you said/ If you say so,” which is their last conversation they had.
Lea Michele’s song, If You Say So, is so sad.

I cried listening to If You Say So.

Oh my god Rebecca! Don’t play If You Say So I’m going to cry!
by Lea Sarfati February 1, 2019
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