This One Time, When I Was Drunk...

They come every 30 minutes for 5 minutes.
1) During that time you should drink the freeze booze on the table (at least 1) while aiming at a Dark Dwarf. You'll throw the mug at them, and an NPC will throw you a new mug.
2) Map this to a key and spam it while turning left and right.
3) If they destroy all the kegs, you will not be able to loot the gear.
4) You can loot the gear once every 12 hours.
5) The gear will be available from :05 to :20 and :35 to :50 (eg 1:05 is when they stop attacking, it'll be there for 15 minutes)
6) This is worth 10 tokens
7) The "whirlwind" effect is picked up from big mugs that randomly appear on the ground
8) Stand on tables and you're less likely to be hit by a DD (serious knockback)

This quest name is very likely an homage to Ron White (They Call Me "Tater Salad") of the Blue Collar Comedy Tour.

At certain points in his career (I saw him in person 12 years ago) he would start segments of his routine:
This one time, when I was drunk, I gave my wife a Midol and I wrapped it in a piece of cheese.

You don't even have to be present during the Dark Iron invasion, in order to loot the "cog" on the ground that gives this quest.

If the group that was present during the last invasion, beat the invasion, then you can come along and loot the cog yourself. (As long as it hasn't despawned, of course.)

If you do that, though, you should stick around and help the next group beat the next invasion, IMO. Too often I see people just standing around during an invasion, and the group of people valiantly fighting off the Dark Iron Dwarves is just too small to win. So if you're around, help out, whether you already have your 10 coins or not! Besides, it's fun!

You don't need to have an active target, the game chooses the closes moving dark iron when you drink.