When a girl, who is a bit of a prude, doesnt't want to get semen on her from a condom or the penis directly so, the male then says "Aye Aye" and proceeds to turn the condom inside out and slap her in the face resulting in a trail across her face that resembles that of a snail.
"Jose finished having sex with Ana and when she told him not to get any on her, he proceeded to give her the Chuco town snail."
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In Central American slang, it’s used to mean someone or something is dirty, smelly, unhygienic, etc.
Mirá, metéte a bañar vos porque andás todo chuco.
No seas chuco vos laváte los dientes antes de ir a dormir.