Characters
Now go and kiss your mother or I'll kick your teeth in!
— Stuart Mackenzie

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker orders someone to go and kiss their mother, then backs the order with a crude threat of knocking their teeth out. The line mixes rough family insistence with intimidation, demanding affection at the point of a threat. Its bluntness reads as gruff, though the violence is stated plainly.
Context reviewed