> The guys at beeradvocate.com say some beers make a good session beer.
> Is that just beer geek talk for a lot of drinking?
>
Not at all.

I *think* the phrase MAY have originated not from the beer-geekery lexicon,
but rather from Irish and Scottish pubs where music "seisuns" (that's the
Gaelic, which may have come from the Latin "sessio" or "sedere", to sit)
carried on the music traditions. I believe the English-language "sessions"
predated the use for "jam sessions" that jazz musicians developed.

A musician who drinks mild beer can play competently all night. A musician
who drinks harder stuff starts playing incompetently. Simple as that.
(Spoken by a participant in many a Guinness-fueled session in a Baltimore
Irish pub.......)