Learner's definition of LAD
1 chiefly British : a boy or young man
a charming young lad
Life was hard when I was a lad.
Well, lad, I hope you won't make the same mistake again!
He's a good lad at heart.
2 British : a man with whom you are friendly : fellow chap
They can't treat us like that, can they, lads?!
He was out drinking with the lads [=(US) the guys, the boys] at the pub.
◊ In British English, a man who is a bit of a lad does things that are considered a bit wild, such as getting drunk and having sexual relations with many women.