I liked the lyric better when I thought he was saying, "freak-quel" and not, as the lyrics here say, "freak we'll call."
I was dead sure he was saying freak-quel, like prequel, which is sniggletification of a Freaky Sequel, the freaky echo that might naturally follow something else. We need a word for "the iterative freakiness that naturally follows" from some event, especially in the context of They Might Be Giants.