The time of year or stretch of social calendar when group daftness reaches its seasonal peak — usually summer festivals, the week before Christmas, or any extended bank holiday weekend where everyone collectively decides sensible choices can wait. Yampy szn is when the group chat goes feral, plans escalate beyond all reason, and the collective yampy energy becomes self-sustaining. It's not a date on a calendar; it's a vibe that descends and takes hold until someone has to go back to work on Monday.
Bank holiday weekend? That's yampy szn — the lads have already planned five different things and none of them make any sense.
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