Driving in the streets of Mexico City requires being aggressive. More often than not, there are no proper traffic signals, and when there are, drivers ignore them. So if you want to take Viaducto, Periférico, Circuito Interior or any other (allegedly) express way, you have to let your car go against other drivers. Their fear for a taste of your vehicle's metal sheet will force them to yield. This act is known as echar lámina (eh-CHAR LAH-mee-nah, lit. to throw metal sheet).
Echar lámina is also used metaphorically to mean a blunt courthip is taking place, letting oneself go in a collision course expecting the other person to yield to one's intentions. Synonyms of echar lámina are echar los perros (lit. throw the dogs), tirar el calzón (throw the panties, briefs, boxers) and tirar la onda (lit. throw the vibe).
The short film below starts with a microbusero (a micro-bus driver) echando lámina. Test your command of the contents of this blog by deciphering the meaning of the dialogues. The name of the short film is La Furia de un Microbusero.