sneaker-upper

The person, the object of a joke or crticism, who happens to overhear or watch while she's being made fun of or criticised by someone who is unaware of this person's, the object's, presence.

A term attributed to Jim Downy of SNL by Tina Fey in her book Bossypants.

The boss was a sneaker-upper standing behind Shiftless while the latter was doing an impression of the former telling everyone to "save money by transcribing invoices instead of wasting money on photocopies."

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