I looked up the meaning of the original phrase, but I was more amused by what the folks at Urban Dictionary had to say about it:
To be Honest tbh
1. To be Honest
an incredibly over-used refuge for the inarticulate to máke a point of statement. Can be used in any sentence as long as you agree with yourself.
i really don't like to stick pineapples up my arse...to be honest. But have you tried a cucumber?
by moose head france (but english) May 7, 2005 email it
2. to be honest
Absolutely pointless statement, that adds nothing to any conversation it is included in. Used by dumbasses to sound "smarter" or "prove a point".Also see: to be
frank, frankly, honestly