A racial slur for Hispanics because of the common occupation of landscaping. But also sometimes used to make fun of a landscaper the same way grease monkey is used to make fun of mechanics.
Asshole:"Speak English you fucking mulch chuckers"
Landscaper: "Actually I'm bi-lingual asshole and nobody was talking to you so what the fuck do you care? Now get the fuck out of here before I rip you four extra assholes with my pitch fork!"
"Yeah it is, I heard last night he was telling all these doods in the bukkake cave that he was the real Dog The Bounty Hunter. After that he had 10 of them ejaculate all over a piece of cake just so he could lick off all their semen"