When one's shit acts like a prarie dog, fanatically poking it's head in and out of it's home expressing it's urge to be freed from the confines of it's hole, but only when it is safe.
(See movie Rat Race)
The act of anal sex without the use of lube or a condom. The person getting dry dogged usually bites the pillow and cannot sit down for quite sometime.
Nick: (on the phone) hey Parker, did you do the geometry homework??
Parker:(on the phone) Bro, seriously, I'm dry dogging it with Melissa right now.