to left swipe something is to refer to Tender. when you don't like someone or something you left swipe.

When you see a picture of someone smoking you would "left swipe that"

In the case of an undesirable erection or a narb (no apparent reason boner), the meneuver done to hide such displeasures from the public eye. The move consists of glancing left, glancing right, then swiping the erection up, to be held by the elastic or waste of the pants.

(verb) to find unattractive : being unwilling to bang even as a random hook up

The words "swipe left" was first used to reject future spouses, potential dating partners, and/or Hillary Clinton on the infamous dating app, Tinder. The phrase has devolped over time and now describes anything remotely ugly or detestable.