To ask someone to prove a negative.
'glenn-becked': as in being asked to disprove a negative which originated in a lie.
President Barack Obama was 'glenn-becked' when he was accused or being a racist by Beck, or having to go to the trouble to disprove something patently false, as was the claim that he was not a 'native born' citizen, the lie was first thrown in planet 'Right Wing' back in the 2008 Presidential campaign.
The claim was totally proved as spurious, but the damage was already done, right winger extremists who listen to these shock jocks, Beck, Limbaugh, Savage, et al, wholeheartedly believed the lie and have been repeating it ever since.
So, Obama has been 'Glenn-Becked' several times.
Coming full circle, Glenn Beck himself is being 'glenn-becked' by being asked that he disprove the internet rumor that he raped and killed a girl in 1990