Johnny Manziel doesn't order champagne by the glass ... he orders it by the bottle ... and yesterday, the Browns QB pounded a bottle of Moet during the USA World Cup match.
Johnny Futbol was hangin' at Galway Hooker Irish Pub in Houston, TX -- standing in the crowded bar with a bunch of other people as the U.S. gave away a victory to Team Portugal.
Sources at the bar tell us ... Manziel arrived to the bar with a pretty mystery blonde -- unclear if the woman was Chantel Jeffries ... who he had been seen with around town earlier in the weekend.
FYI -- Chantel has been connected to a whole bunch of big stars ... including DeSean Jackson and Justin Bieber.
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