The abbreviation of, most commonly, mother fuck. When used with an exclamation point instead of a question mark, it becomes an exclamation of amazement, confusion, disbelief, ect.
Mother Texting Firetrucker - an expletive phrase created by Winona for her mother Helena in response to her constant use of chatspeak to text, comment on facebook, & other social networks like a teenager despite being 45 years old. It employs the use of the firetruck word in lieu of the more inflammatory word created when one drops the "iretr" from the middle of "firetruck".