Actual explanation, Craig Ferguson was a late night talk show host. At some point he had Grant Imahara from myth busters build him a robot Co host, he did, it had an articulated head and mouth and arms that moved - and it had a sound board. The sound board offered, of course, limited options. He had a few phrases that he could say. Later they revised Geoff and had him voiced by the actor linked in the video above. He said things like in your pants, balls, etc. and it was generally hilarious. I loved the show, the sketches, and as a Dad, enjoy old jokes. There are at least 4 of us who got it, so… Mission accomplished pretty much
https://youtu.be/D2hhIFTla9w