"Macca" is the term used when someone is talking out their ass. Absolute bullshit. Over exaggerating to make them seem bigger or better than they actually are.
Lad: I fucked her all night she loved it.
Mate: lad no you didn't, you talking macca.
1.Adj. A wealthy pikey.
2. Someone with kitsch taste who can never combine a pair of trousers with the appropriate top; has very bad taste in shoes and showcases the most appalling table manners.