In regular spanish, is the way you call a baby romper. Its the Mexican Slang way to say felatio. Other ways are una mamada, un chupón.
Abri la puerta, y vi a Miguel recibiendo un mameluco de un hombre. / I opened the door, and saw Miguel getting a blowjob from a man.
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I hope you have learned something new, about the spanish that real Mexicans talk on their everyday life.
If you want to improve your Spanish, I also give tutoring lessons on skype using this page that host many teachers from all over the world, and while I don’t really do grammar, I can help with conversation and doubts about the language. Also, if you are interested in any language besides spanish, there are teachers and tutors for any language there.