I haven't been able find any commentary on the satire concerning Galba in Suetonius, and particularly, what was being alluded to by the quip, "Here comes Galba from his farm", and what exactly were the "appropriate gestures" for this audience participation chorus? Judging from Galba's reputation for brutality and sodomy, we could probably take a guess! As Galba was known for calling upon his "useful" (Onesimus) slaves, so Rome was now calling out for Galba to "service" them, or something to that effect.
The name of Galba's favorite (homosexual) servant Icelus certainly makes for a pun with the English word "useless"!
We should also note that Mucianus was a notorious homosexual. (Were there any straight Romans?)
All of this does seem to strengthen Joe Atwill's take on the anal humor/double entendres in the Book of Philemon:
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