I don't know why I have these goggles 

A phrase uttered by those who have given up on life after realizing their existence is meaningless, futile, and possibly fraudulent. Etymology: Aqua Teen Hunger Force episode "Dumber Dolls"

Happy Time Harry: Hey, wiggle jiggle, why you jiggle so much? Is it because he know deep inside you're a fraud? ... What the hell do you need night vision goggles for? You're a hillbilly!

Jiggle Billy: I don't know why I have these goggles ...

I don't know why I have these goggles by Cephiroth May 15, 2010

I don't know about that one chief 

A phrase that is slang for no, normally used when in relation to an activity

Ex.1
Guy 1: aye, pass the bong
Guy 2: I don't know about that one cheif
ex.2
Guy 1: ay bruh, can you pull out?
Guy 2: I don't know about that one chief

I don't know about that one chief by 20$ is 20$ September 18, 2018

I don't know your life

Phrase exclaimed by those working in fried chicken restaurants when they don't know what else to say

(Like, "Oh, sorry, my mistake)

**As witnessed at an actual Popeyes by T. Dale Shaw**

Elderly Woman: I called in an order for 300 pieces of chicken.

Popeyes Worker: (audible smack) Is dat fo here o to goes?

EW: Honey, I can't eat 300 pieces of chicken.

PW: Bitch, I don't know your life.

I don't know your life by dilbear February 25, 2005

I don't know if I need a shit or a haircut

Originally Northern Irish, this expression shows confusion. As in:

(1) I'm so drunk I don't know if I need a shit or a haircut!
(2) What the fuck are you talking about?! You don't know if you need a shit or a haircut!

I don't know if I need a shit or a haircut by Bobby8585 July 30, 2008

i don't know how to respond to that 

When someone either genuinely does not know how to respond to something or is trying to avoid the topic of conversation. Often used to make situations awkward, and can be used to end conversations.

friend: my girlfriend just cheated on me
me: I'm so sorry to hear that
friend: I wish I could get over this in two seconds, ugh I hate life.
me: I don't know how to respond to that

i don't know how to respond to that by Born_2_Win_145 May 12, 2019

I don't know what to tell you 

A phrase used to tell another person to politely say, "I have no interest in continuing this conversation or listening to you complain." In its hardly ever used long form, it would be used as, "I don't know what to tell you to get you to shut up." Extensively used when people present you with a problem, you offer advice to them on viable solutions, but they come up with excuses why they can't follow your advice.

Person A; "complain, complain, complain. My car broke and I can't get to work now. And boss says he'll fire me if I miss another day!"
Person B; "Take the bus."
Person A; "There's no bus route within a quarter mile, and my feet hurt so much."
Person B; "Take a cab."
Person A; "I can't afford a cab with these car repair bills!"
Person B; "I don't know what to tell you."

I don't know what to tell you by Edward C. Microwagious IV May 31, 2010

I don't know about all that 

An expression indicating extreme doubt, often implying that the suggested idea was a terrible or unwise one.

"Dude, would you do acid if I offered you some?"
"I don't know about all that."

I don't know about all that by Paul L-K (while blunted) March 22, 2005