From Longman Dictionary of Contemporary Englishsquishsquish /skwɪʃ/ verb 1 [intransitive always + adverb/preposition]SOUND to make a soft sucking sound by moving in or through something soft and wet2 [intransitive, transitive] informalSQUASH to squash something, especially something soft and wet, or to become squashed→ See Verb tableOrigin squish (1600-1700) squash