If Groupon was Battletoads, it would be like I made it all the way to the Terra Tubes without dying on my first ever play through.
DAAAYUMN! That’s level 9 out of 13, not bad bro!
So there are really two specific things that Mason is implying with this reference:
To get to the Terra Tubes on one’s first try, having never played the game before, would be a Herculean, almost impossible, achievement. Therefore, getting this far with Groupon was in and of itself either a colossal feat of genius or a lucky miracle, depending on how charitably you want to interpret the metaphor.
Dying on the Terra Tubes, which are designed to make you die over and over, is no shameful thing.
To help improve the meaning of these lyrics, visit “Groupon Farewell Memo” by Andrew Mason and leave a comment on the lyrics box