It was a segment on Oprah's show where she swung from a harness she was in and yelled out "My Va-JayJay Is Painin'!" -
A clip wound up on the show "The Soup" ,host Joel McHale ran it as often as he could in subsequent episodes.
Its incessant play wormed and warmed its way into the lexicon.
It is pretty funny, nothing psychological about it - just good dumb fun.