Doing something for fun, or for no particular reason.
"I just ate a Carolina Reaper."
"Why?"
"I dunno, gits and shiggles."
user 1: i love doing the shiggle wiggle
user 2: oh dear god help me
damn dat gurl got a nice ass but she got sum shiggle gitties....
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shitting and giggling at the same time.
"I laughed so hard that I started shitting and giggling at the same time. Mike told my wife I was shiggling."
To shiggle - to do something for the shits and giggles.
Junior: Why did you put that pizza on the roof?
Walter: I'm just shiggling, #YOLO.
To have sex with someone until you Cum and your nuts shake.
Oh, I have the shiggle nuts!