SAY WHAT: Soulja Boy cops 55MIL Private Jet for 21st Birthday

Soulja Boy doesn't know the meaning of the word recession -- because TMZ has learned, the 21-year-old rapper is dropping $55 MILLION on a new private jet.

TMZ reports the rapper spent a whopping $35 million on a private jet and another $20 million to customize it to his liking. Soulja added "12 Italian leather seats, flat screen TVs, four liquor bars, a special travertine tiled floor, and Brazilian hardwood cabinets to his personal aircraft.

A member of Soulja's management team tells us ... the kid bought himself a G5 jet as a birthday present to himself this week.

After doing some research it seems as if Mr. DeAndre's net worth is only 25 Million...so how could he afford such a lavish gift for himself. #SUSPECT

And if that's not enough for someone's 21st -- we're told Soulja's also spending $300,000 to throw himself a blowout birthday party at ClubPlay Miami tonight ... Dwight Howard, Bow Wow, and Sean Kingston are all expected to attend.

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