"Wiggly crochet" is a surface crochet technique, meaning that you crochet onto the surface of a fabric to get the desired effect. There are various other surface crochet techniques; with this particular technique, people typically crochet onto a mesh worked using double crochet and chain stitches. The mesh might be the same sort of mesh you'd make for filet crochet, except without any filled-in blocks. In some cases, people prefer to work the mesh in the round. The mesh itself is hidden when the surface crochet is applied to it, so the effect is vastly different from the effect achieved in filet crochet.
There are other possibilities as well, and you will see some interesting variations if you peruse the pattern links posted below.
01 of 06
These potholders might or might not be vintage, but they sure do remind me of a vintage look.
02 of 06
This tutorial is posted at the "Nonna Luna" blog.
03 of 06
This solid-colored hotpad is pleasantly textured. The free pattern is posted at the crochetnmore website.
04 of 06
This baby blanket features bunches of "wiggles" crocheted in colorful wiggly stripes.Continue to 5 of 6 below.
05 of 06
Here's a pattern for a cute granny square with "wiggles" all over the surface of it.
06 of 06
Yet another multicolored wiggly crochet hotpad. This one is posted at the Angelfire website. You may have to close a popup to see the free pattern.