big guy
/ˈbɪɡ ˌɡʌɪ/informal (originally US )
noun
1As a familiar or affectionate form of address to a man or boy.
2Chiefly with the. A boss or leader; a powerful, wealthy, or prominent person. Frequently in figurative context, denoting such people as a class.
3With the. God.
Origin
Early 20th century; earliest use found in The New York Times. From big + guy.