mother fucker
a comparitive expression meaning: extremely or very.
the subject is compared to a mother fucker. 
can be used to emphasize any adjective.
commonly using these forms: 
"(adjective + er) than a mother fucker"
or
"(adjective) as a mother fucker"
colder than a mother fucker = extremely cold
hot as a mother fucker      = extremely hot

add the following (adj + er) words to the blank to get a feel for the versatility of this expression:

_______ than a mother fucker.

dumber, stupider, smarter, cooler, worse, smellier, harder, sillier, faster, slower, louder, funnier, duller, uglier, spicier, sharper, more boring...
