The Ambushers 1

One of the later Matt Helm films, this sets new lows even by the revolting standards of this series. 

Helm is played by Dean Martin, who plays him as a bleary eyed, sodden boozer, who leers at his "Slaygirl" assistants, and dances like a drunk killing cockroaches.  His secretary is called "Lovey Cravesit" (really) and the dialogue would seem unusually crude if written by a gang of horny thirteen year old boys.

And the plot?  Don't get me started.  It involves the theft of a flying saucer that gets hidden in a mexican brewery, and requires Dino to slide down a mile of railroad track on his ass.  High in the running as one of the worst films ever made.