squish 
(skwĭsh)
(skwĭsh)v. squished, squish·ing, squish·es
v.tr.
To squeeze or crush together or into a flat mass; squash.
v.intr.
To emit the gurgling or sucking sound of soft mud being walked on.
n.
1. A squishing sound.
2. Slang A person regarded as weak and ineffective.
[Probably alteration of SQUASH2.]