That’s reverse reverb. Reverse the track (i.e. turn it backwards) apply reverb(eration), then reverse it back the right way round, e.g. here.
Reverb(eration) tips here … Good Gverb settings for song vocals?
For Brrr effects you could try ring modulator* (download plug-in here) or vocoder which is shipped with Audacity (see bottom of “effect” drop down menu) .
[NB: more that one effect has been applied to create the Youtube alien voice ]
[* IMO there is ~200Hz triangle modulation producing the “Brrr” ]