Sentence:  They would <WSD>jimjam</WSD> and jitterbug flirtatiously up and around the bump in his lower nape and behind the ridge of his ear for a minute or two, and then as if yanked up and away by some resentful mother spider disappear until the next day or the day after when they would dance just a little bit longer than the time before -- until he found he could almost command their presence. 
Meaning of the word marked with <WSD> tags:  To dance ecstatically.