The term 'SOUND OF A SOCK' can be summarized by two crossword solutions: BAM and POW. BAM is an onomatopoeia that is used to represent a loud, sudden sound, such as the sound of a fist hitting something. POW is also an onomatopoeia that is used to represent a loud, explosive sound, such as the sound of a firecracker or a gunshot. Both BAM and POW can be used to describe the sound of a sock hitting something, such as a wall or a person.