As an online discussion grows longer, the probability of a comparison involving OP's genitals approaches; That is, if an online discussion (regardless of topic or scope) goes on long enough, sooner or later Dermott will compare someone or something to some aspect of his own genital componentry.
Bill: 'You're eating that potato rather quickly'

Ted: 'Careful you don't choke on your spuds!'

Dermott: ' If I could choke on my own spuds I'd never leave the house!'

Leovinus: 'Ah, Dermott's Law in action!'
by Leovinus October 11, 2017
Get the Dermott's Law mug.