(control engineering) A mathematical model of a physical system as a set of input, output and state variables related by first-order differential equations.

To stuff; to lard; to farce.

(idiomatic, disapproving) to appear or emerge unexpectedly or inexplicably, frequently in large numbers or quantity.

A small donkey, especially when used as a pack animal or one that is feral and lives in the southwestern United States or northern Mexico.