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1.
Of colossal excellence or greatness. The most esteemed level of hierarchical stature.
"Boy, I tell you, that Andy Ford (www.andyford.com)is one stupendous muthf*cka!
by Gay Gayerson July 03, 2003
 
2.
another, better, word for terrfic, amazing, awesome....etc
last night was stupendous, today at school we had a food fight, it was stupendous!!

Main line: how was your day?
Response: STUPENDOUS!! =]
by Mattt Zollinger April 05, 2008
 
3.
Colossally inept or stupid.
Bubba, you the most stupendous person I ever known.
by harry flashman July 17, 2003