it might be 'What the real fuck'. I wrote it as typo a minute before I went to post it here. It would not be a synonym to WTFR, because WTFR feels like if you are expressing shock.
I would put it somewhere between WTF and WTBS.

Began as a typo in a chat room one day. An extreme version of wtf (what the fuck). The debate is still going on as to what the R stands for. Some suggestions have included Raging and Rabid.

Generally stands for 'What the royal fuck'.

A more grandiose version of "wtf" (What the fuck).

Used when "wtf" just isn't enough to express one's surprise/shock/anger etc.

Commonly suffixed with numerous exclamation marks/question marks.

Capitalisation is often used to express further surprise/shock/anger etc, but is not essential.