Pec Pop is the first/entry level of pectoral control. A minimum muscle control has been established to cause small contractions but the performer hasn't advanced his muscle control to meaningfully control the sternal head of the pec major.
Our gallery used to track this level of pectoral control in the past but no longer finds the reason to because, when compared to the average pec bounce skill, this level is inadequate and not worth-mentioning.
Our Youtube playlist of this control may be found here.