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1.
When one slaps his ejaculated penis in another's face smearing cum everywhere.
Dude, I totally gave your sister a sloppy milky slap last night.
Por Ryan Huie 13 de febrero de 2005
 
2.
The act of slapping one in the mouth with a penis after the mouth has been filled with ejaculate.
Randy's leg looks like somebody just gave it a milky slap.
Por Wes 14 de febrero de 2005