Usain Bolt -- Breaks Another Record ... Longest Handshake Ever

For a guy who trades in speed, Usain Bolt really takes his time when it comes to his bros ... with the longest, most elaborate handshake ever.

Here's Bolt -- greeting fellow Jamaican sprinter Edino Steele -- in a choreographed handshake that includes everything from hand slaps, double claps, high fives, poses, pointing ... and even the "Nae Nae."

The greeting went longer than the allotted 15 seconds for an Instagram video ... and may still be going on right now.