pink elephant in the room 

A "pink elephant in the room" is a phrase used to say that there is something very obvious, one cant miss it, yet no one wants to be the person to point it out or talk about it. Its assumed that everyone has noticed it. It may be that pointing it out is politically not correct, impolite, or offensive.
This phrase was first introduced by Sam Senev who brought an actual pink elephant to a speech as a social experiment. After the speech the audience was polled about their opinion. He often uses the same pink elephant in meetings and speeches.

Her body odor was the pink elephant in the room.

pink elephant in the room by PinkElephantInTheRoom October 13, 2017

The white and pink elephant in the room 

A costly and troublesome hallucination which nobody wants to mention.

It's also an intentionally confusing combination of the expressions "white elephant", "pink elephant", and "elephant in the room", which are now being conflated on the internet.

K: It was the pink elephant in the room.

B: You mean "elephant in the room"
K: No, I mean pink elephant in the room
B: I don't think that's a thing.
K: So what's a pink elephant?
B: Maybe I'm confused with a white elephant?
K: googles it
K: Look! It's on Urban Dictionary! I win.
B: This is the white and pink elephant in the room.
K: I think you're hallucinating.

The white and pink elephant in the room by LonePollux October 27, 2018

the pink elephant in the room

you swear it exists or has existed at one point in time, but no one else believes it or have seen it

we never talk about it...it's like the pink elephant in the room

the pink elephant in the room by reecer August 3, 2004