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1.
A euphemism for mother-f***ing. Recently seen in the televised version of Snakes on a Plane.
Samuel L. Jackson: I have had it with these monkey-fighting snakes on this Monday-to-Friday plane! (Cocks gun.)
by MrSmartyPants April 26, 2009
 
2.
Monday to friday makes for a euphemism of 'motherfucking hell' which reflects the general notion the working life some may lead towards duty.
Oh 'monday to friday' about the bosses duties, can he not relax a little.

How in the 'monday to friday' are we supposed to achieve this duty.
by Squirrelpower September 26, 2011