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1.
Rastafarian or Jamaican origin. A synonym meaning "here" and "I'm here."
As in the song Tomorrow People, "Today you say you deyah. Tomorrow you say you're gone."

here
by CaptainZlogg January 30, 2010
 
2.
the most beautiful girl in the world always has your back shes sexy funny and fun to talk to she has a great personality and smile if you ever meet a deyah never let her go
Don't ever let that deyah go.
by PDuB February 24, 2013
 
3.
A person in Brazil who lures teenage Americans to Brazil to become under aged sex slaves or kidnap them for random money. Referencing the semi-famous kidnapping case when a young boy from Illinois was lured then kidnapped (and later forced to become a drug mule in 2009) by a mysterious Brazilian with the screen name Deyah.
Don't go to Brazil, you might get deyahed.
by ash0ka March 08, 2009