Milk a duck: v. The futile attempt to accomplish the impracticable; Taking on the impossible

"Why you always talkin' to the minks, Willis? you know you just milkin' a duck! You couldn't get pussy in a cathouse, man!!"

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Mess with nature: v. To intervene in the copulatory behavior of a man and a woman

"Yo Slick, check dis he'a slice o' de bread - Jack be bent runnin' col', bound t' bump uglies wit' a fly new mink in de burnin' box when in come his ol' lady givin' muddy waters, killin' all dat noise quick."
"Sheeeit, i's a real shame when a man's apron be messin' wit' nature like dat!"

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Monking: v. Isolating oneself from other persons, whether due to time spent in solitary confinement in prison or as a voluntary action; Being alone

"You hear 'bout Arthur?"
"I got de down low. He went all ape-shit on a guard, tweaked his mug an' ended up monkin' fo' ace-deuce spin' o' de big cheese. He got de mojo, not gettin' back do' parole fo' dat action."