When i fly into an asteroid and only the guide nipples on the front of my base make contact (overlap) with an asti dose that still count as a collision ?

Yup

It's in the Rules Reference under "Guides". The guides only count for maneuvers and overlapping, not for combat measurements.

First time I've heard the guides referred to as nipples...

First time I've heard the guides referred to as nipples...

Yeah, it brings up some scary mental images at first.

calling them nipples is disturbing.

First time I've heard the guides referred to as nipples...

Yeah, it brings up some scary mental images at first.

That's how little Exogorths become big strong Exogorths