Using celebrities in advertising is guaranteed to pull in big bucks.megameg‧a /ˈmeɡə/ adjective informal 
Their first record was a mega hit.—mega adverb
COLLOCATIONS FROM OTHER ENTRIES
very big and impressive or enjoyable: (=a lot of money) Using celebrities in advertising is guaranteed to pull in big bucks.
Using celebrities in advertising is guaranteed to pull in big bucks. Their first record was a mega hit.—mega adverb