So far I have definitions from Tony Abell, Tim Lodge, Judy Madnick, and Efrem Mallach.
I have two other "might know it" emails: no, spit-frog is not the same thing as frog-spit if you happen to know that. Nor is it the same as gorf-tips (for fellow 80's arcade denizens).
You still have a bit over 19 hours to the deadline: Saturday 6am PST / 9 am EST / 2pm UTC/GMT / 3pm CET / Sunday 3 am NZDT