This's a Joel Valentine sound effect.
It is NOT to be confused with any of the Hanna-Barbera/Universal Studios explosions, even though Joel Valentine tends to use higher-quality, processed and/or modified versions of that infamous "POH-WAHH-WAHHHHH!" sound.
None of the audio samples previously uploaded are correct; they are processed/cleaner/modified versions of the H-B/Universal explosion. The sound effect can be referenced from 3 out of 4 images in the image gallery (not sure about DC Super Hero Girls).