I had the same problem for a while MatyadaLover and was going to raise the same point when I was struck by a thunderbolt ! You may have made the same mistake that I did and put in "imitates" instead of "impERSONates" with JEFF appearing in the across answer.
Brilliant! Thanks, that's exactly what I did. I found that there were many words that contain "erson" but only "jeffing" ... it never occured to me to check the meaning of "jeff"!
I wonder If I can send in a second entry ...? Now there's a moral question.