biggie
noun
[ ˈbɪɡi ]
• a big, important, or successful person or thing.
• "composers including most of the biggies like Brahms, Wagner, or Mendelssohn"
Origin:
1920s: from big + -ie.
no biggie
• used to indicate that something is of little consequence.
• "no biggie, I'm not in a hurry"