“what will you get for the lot that you’d get?
Appear been pledge to pull off and overlook.
Posses all days and gone without end, ceaselessly.
Presently got the birds off their feathers.”
- Victoria the Victorian II - January 2009.
Loosely, "even more so" or "with even stronger reason". Often used to lead from a less certain proposition to a more evident corollary. It is unwise to invest in pyramid schemes, and, a fortiori, in e-mail pyramid schemes.