I da MAN!" = "Little Man
When a guy acts like he’s the toughest man alive, but then he has to deal with a little man who’s the opposite of tough and cries at everything.
He said 'I da MAN!' like he was a superhero, but his little man cried when he dropped his toy.
He yelled 'I da MAN!' after getting laid, but now he’s stuck with a little man who cries at everything.
He thought he was tough, but his little man just cried when he got a tiny bruise.