A squildo is a guy in an office setting who never learned how to use his inside voice, most likely dresses like a queen during the weekends, and wants everyone to know how great he is at life.
Surprising someone by wiggling your finger up one's anus (without them knowing), while yelling "SQUIGLY FISH!". Clothes may or may not be worn during this.
*John is standing in line at the concession stand waiting to get his popcorn*
April: SQUIGLY FISH!!!!
John: HOLY FUCK! YOU GOT ALL THE WAY IN THERE DAMMIT!
April: Yeah what can I say, I'm just good like that.