Someone who thinks that they are a real player after having a party and drinking alcohol. This Alcohero syndrome often occurs in prepubescent boys who had just experienced their first taste of alcohol, they also feel the need to brag on about it the next day - trying to seek enormous amounts of attention.
Alcohero Boy: 'Awh dude! You should have seen me last night drinking all that booze! I was totally wasted! I'm sooo cool!'
Other person: 'So how many beers did you have?'
Alcohero Boy: '...one.'