Hi,
There is an earlier use of this expression, in a more positive sense and the gesture on stage was probably silently quoting it:

ARTIST: Bob Marley and the Wailers
TITLE: Stir it Up


{Refrain}
Stir it up, little darling, stir it up
Come on and stir it up, little darling, stir it up

It's been a long, long time
Since I've got you on my mind
And now you are here, I say it's so clear
See what we can do, honey, just me and you
Come one and

{Refrain}

I'll push the wood, then I'll blaze your fire
Then I'll satisfy your heart's desire
Said I'll stir it, yeah, ev'ry minute
All you got to do, baby is keep it in and

{Refrain}

Source: Gunther Anderson
Best regards
wsieber