Definition

Glasgow street slang for Mogadon (nitrazepam) sleeping pills—central depressants commonly used to take the edge off stimulants or provide quick shut-eye. Classic pharmaceutical slang from UK club culture.

Example Usage

After coming down from that ecstasy, he popped a couple moggies and crashed hard.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=moggies&defid=2094266)