Medium-religious Fox News commentator Todd Starnes gave it a go and now Washington Post columnist Kathleen Parker.
Here's how she defines "twerking," as made mainstream by singer Miley Cyrus, for the uninitiated (via Parker's Wednesday op-ed):
The impulse to replicate animal behavior ... the lascivious gyrating of one’s fleshy extremities...
Starnes defined it as "a sexually provocative form of dancing that involves lots of jiggling."
For what it's worth, the Oxford Dictionary has just added "twerk" to its lexicon. Read the official definition here.