Similar to an alcoholic hangover, except that when you wake up the next day, your ass is on fire. Other symptoms include full body sweats, trembling, heart palpitations, irritability, ring of fire, mud butt, and air biscuit. Primary cause is consumption of foods containing hot peppers, especially jalapeños.
Me: I won't be into work today - I think I have a jalapeño hangover.
Boss: I think we need to talk about your jalapeño problem.