what is bam in spanish
bam as in to smash somthing
You're looking for examples of onomatopoeia in Spanish.
Stobber was on the right track with onomatopeyas (and is getting my vote for spelling it correctly ).
I have often seen Pom or Pom-pom or Pof
If you want to supplement what has already been given you can check out this link:
If you want an even more comprehensive list, they have an actual diccionario de onomatopeyas available in Spanish, but you will have to shell out a few dollars to get a hold of one.
Something along the lines of 'PAU' works. I have heard it before, not quite sure about the spelling, but it's the same thing as pow. The BEST answer I can give, however, is the same word with an extra letter: BAMM! In reference to Los Picapiedras or 'The Flintstones.' Check out Bamm-Bamm Mármol on Wikipedia.
"bam" doesn't exist. Is not a word in Spanish.