Top Definition
As an online discussion grows longer, the probability it being reduced to dick jokes approaches 1.

c.f Godwin's Law

Note: invoking Cathcart's Law massively increases the probability of dick jokes, as it contains the fragment "grows longer".
(following a lengthy conversation about GPS)

Steve: My GPS has a 3" screen, and it's perfectly adequate for my needs.

Tim: Yeah, but how long do you want to be staring at a 3" thing?

Steve: ...

Tim: Cathcart's Law!
by baztastic March 10, 2011
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