Chingazos is a very colloquial and somewhat aggressive slang term in Mexican Spanish, often meaning 'blows' or 'punches'. It comes from the versatile and often vulgar verb 'ch*ngar'.
In the context of "Puro Campeón," the phrase "Hoy le ando echando chingazos" means "Today I'm putting in a lot of effort" or "I'm working hard." It conveys a sense of fighting and struggling to achieve a better life, making it a vivid and memorable word that captures the song's gritty determination.
"Puro Campeón" is a corrido about earning your place the hard way and refusing to let anyone shrink you once you get there. The singer looks back at starting from nothing, working nonstop, and never backing down, even when things got difficult.
Now that he's built something real, a team, a bit of money, a way of dressing well, he's ready for the people who used to look down on him and now come around asking for favors. He stays gracious about it (a slap with a white glove instead of a kick), but he's clear that loyalty only flows one way: he helps the people who were always there, not everyone who shows up now.
The hook says it plainly: no matter who it hurts to hear, he's at the top, a true champion, and he got there piece by piece.