“Пиздец всему“ which translates approximately to “Fucks everything”
while its performance might have been somewhat lackluster against the bigger nazi heavy tanks thanks to the sheer thickness of their armour (like the ferdinand and the king tiger), the su-100’s gun was so effective it was also used on the t-54 and t-55 tanks, which were built into the 1970s.
it is, i feel, worth noting that while the su-100 was very effective, it was based on a fairly flimsy medium tank, which rendered it pretty vulnerable to a lot of incoming fire.
my personal favorite nickname for soviet ifvs, however, is for the isu-152 family. these were self-propelled guns that excelled in killing those heavy tanks mentioned above; due to the nazi tendency to name tanks after dangerous animals (panther, tiger, elephant, wasp, etc) the guns became known as Зверобой, which translates to “beast killer”
I’ve also heard “Zoo Keeper”
Thoughts From The Peacock Angel 