That's What BP Said 

A variant of "that's what she said." Instead of referring to sexual connotations, it is used to refer to spending a lot of money, making a mess, or fucking up very badly. Arose after the 2010 BP oil leak in the Gulf of Mexico.

X: Oh man, I really screwed the pooch on that one.
Y: That's what BP said!

X: It's going to take me all day to clean this mess up.
Y: That's what BP said!

X: I'm paying tonight. The sky is the limit.
Y: That's what BP said!

That's What BP Said by Hamfry June 11, 2010

That's what BP said 

Instead of "that's what she said", but referring to an embarrassing situation, or something that one would rather cover up.

Buffy: "I don't want to go to the beach. I'm having a heavy flow day."

Heather: "That's what BP said!"

That's what BP said by jasonspsyche June 23, 2010