Winter is icummen in,
Lhude sing Goddamm.
Raineth drop and staineth slop,
And how the wind doth ramm!
Sing: Goddamm.
Skiddeth bus and sloppeth us,
An ague hath my ham.
Freezeth river, turneth liver,
Damn you, sing: Goddamm.
Again, “th"s indicate verbs, so the "bus skids.” However, note that “slop”, has now become a verb, “sloppeth”: the bus kicks up slop/slush/grimy shit.