Johnny Manziel Buys Bar 300 Shots

Johnny Manziel drowned his NFL draft night sorrows in Fireball Thursday night ... ordering up 300 SHOTS at an Ohio bar for a few hundred of his not so closest friends ... and TMZ Sports has the video.

Two years after he was selected in the 1st round ... the unemployed QB hit up Dahlia Bar and Lounge in Columbus right after the 1st round of the '16 draft wrapped up.

You can see in the video Johnny was in a generous mood ... buying 300 shots of whiskey and some Miller Lites for the crowd.

We're told Johnny spent the night hanging out in the DJ booth with Justin Bieber's tour DJ ... JB had a concert in Columbus on Thursday, but was a no-show at the bar.

Earlier in the day, Manziel was reportedly hangin' at ANOTHER Columbus bar ... watching the draft while sporting a white headband -- the same headband he was rocking later that night.

FYI, the Browns drafted a WR last night ... if only they had a QB to throw him the ball.