To break up with someone;
To
dump someone;
To not be attracted by the appearance of someone.
Stemming from the dating app Tinder (Android and
Apple) where swiping the photo of a
person to the right indicates (sexual) attraction.
"I
don't like her anymore, I think I'm gonna swipe her to the left."
"That bloke is so
ugly, I most definitely would swipe him to the left."
"Although you are not in love with him anymore, it is always
hard to swipe someone to the left."