When a person is receiving head from someone and their girlfriend or boyfriend calls them and to not get caught in the act they put them on speakerphone and carry on a normal conversation as if nothing is going on.
Jack: I was watching a movie with Jill and then she started to give me some brain and in the middle of it Sue, my girlfriend called.
Bob: What did you do?
Jack: I just put Sue on speakerphone and talked to her while Jill gave me the best brain ever.
Bob: Did she realize what was going on?
Jack: Nope not a thing. Speaker!
Bob: Hahaha, speaker!