Used to express extreme surprise. Meaning, Oh my fucking god BBQ. The BBQ is added at the end to lengthen the acronym and make the statement more meaningful.

Running for exercise and picking up trash you find along the way. It's good for the body, mind, soul, and environment! Started in Sweden but is making its way to the U. S.

The is part of a combo-chain of phrases used to express increasing levels of excitement or emphasis.

Firstly the OM(F)G, and then usually (and interchangeably) WTF and/or BBQ.

Including BBQ/WTF after an OM(F)G is often a sign of sarcasm.

Oh my freakin' gosh barbeque