A parody of "sudden adult death syndrome" that suggests there is no such thing as SADS, but that in fact adults are dropping dead as a result of being vaxxed.
A: Did you hear that John died of sudden adult death syndrome?
B: More like he died of sudden "I doubt" death syndrome.
by The Gideon Lion June 23, 2022
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A reference indicating that the person being doubted is lacking in the mock politeness required to convince someone that the person really cares about attending to events, duties or rituals that no-one should ever be asked to perform.

From a quote from the movie Donnie Darko. Sparklemotion is a set of six year old girls doing a Solid Gold dancers act.
You're not going to the Berkeley protest for organic leeks? Somehow I doubt your commitment to Sparklemotion!
by Will Sargent January 25, 2005
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Used primarily when you are 200% sure that the statement you just heard is straight horse cockery and bullshit.
Donaldson: I came across a flaming car wreck and pulled out all the passengers and put the fire out

Reigelsperger: I fuckin doubt it!
by Tarawa COC S3 January 22, 2011
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