The Ferugi is an action named after its creator. The Ferugi Involves Forming a thumbs up configuration with you hand and then raising you arm at the elbow so your thumb points behind you.
Apparently it is used to re-enforce a point, (Citation Needed Ferugi?)

A portmanteau of carpe diem, a Latin phrase that means “Seize the Day!” and DM, which stands for Direct Messages. This word means seizing the day via DMs.