This is how you sign Last month in American Sign Language.

Description

To sign "Last month" in American Sign Language (ASL), flick your wrist so that your fingers move straight towards your shoulder in a quick motion. While holding your non-dominant '1' hand upright, take your dominant '1' hand, lay it horizontally before the other hand, and move it down from the top of your non-dominant index finger till you reach the back of your non-dominant hand.