How was it recorded? No clue, but here is what I think they did in terms of post-processing stages.

Use an EQ to take out some of the highs and lows or use a multi band compressor for a similar effect.
Two takes were done in that sample and panned hard left/right.
There seems to be some distortion applied on higher gain input levels but I'm not sure what plugins would give you that result.

It's also quite clear they didn't adjust timing or pitch in the studio as it's all over the place.