grity posted his original capture of Bonin's "stirring the mayonnaise" technique in June 2011, and again in
post #431 - AF447 Thread No.7. As grity points out, Bonin's movements weren't fast enough to actually make mayonnaise!
jcjeant may have coined the phrase in these threads, but one has to wonder whether it is the visual search for reaction clues, rather than real SS feedback that leads to the "stirring" technique.