Heavy? Hold my pint

[Anvil]

The opening riff to World Eater... or the 94 version if you prefer

[Cailleach]

Color Trip - Ground Level Sex Type
Coroner - Gin
Meshuggah - Abnegating Cecity

[Slaughterday]

The bass intro and opening riff to 'Service For A Vacant Coffin'. Shakes the bowels every time.

[ijnjnijnilijbibbjknkjbjkk]

The opening riff to World Eater... or the 94 version if you prefer

Good call. First version 

[Circlepit]

https://m.youtube.com/watch?v=U9uxSdTwDTE&ra=m



When the vocal kicks in... it's crushing.

[NINE-T]

Hell awaits

[Black Shepherd Carnage]

Taking heavy in the sense of some kind of lava-thick psyche-paralyzing chaos-spawned organic ooze enveloping and crushing your very being, then there's also this:
https://youtu.be/1SEB40K3CxU?si=bdMCGDNI2AOEoFqI

[Pentagrimes]

This is another one that floored me when I heard it first in terms of heaviness though i guess you'd be forgiven for finding it a little thin production wise. But the whole feel of the thing is crushing. even with all the melody/clean guitar.I'd just play that whole "Dusk" cd ep over and over again as loud as I could when i got it.

https://www.youtube.com/watch?v=rkDoo7WhlU4

I'd have to agree with "Hell Awaits" as well, first Slayer song I ever heard. I was genuinely terrified of it as a kid !

[The Heretic]

Found this by pure coincidence 

[vinterland]

Don't know how it hasn't been mentioned yet. One hour's worth of this unforgettable riff on repeat.

https://www.youtube.com/watch?v=nAVPuWYMUyo&list=RDnAVPuWYMUyo&start_radio=1&t=395s

[Bürggermeister]

Celtic Frost is the right answer but this also rings true for me

https://m.youtube.com/watch?v=WPoMA5EGnLc

[OpenSores]

Celtic Frost is the right answer but this also rings true for me

https://m.youtube.com/watch?v=WPoMA5EGnLc

Good call sir