It is the action of performing oral sex to an animal.
'Dude, last night, I saw this porn video of a girl salooming a dog!'
'I feel like giving a saloom'
It is a prank that is considered brutal and very mean. The purpose for making such prank can either be to harm the person mentally, or for the mere enjoyment of watching others suffer
'Mike : Yo, did you hear about the juan i pulled in the girl's bathroom?
'Kyle : dude, the whole school knows. Nice juan man!'