From The Collaborative International Dictionary of English v.0.48:
Souse \Souse\, v. t. [imp. & p. p. Soused; p. pr. & vb. n. Sousing.] [Cf. F. saucer to wet with sauce. See Souse pickle.] 1. To steep in pickle; to pickle. "A soused gurnet." --Shak. [1913 Webster]
2. To plunge or immerse in water or any liquid. [1913 Webster]
They soused me over head and ears in water. --Addison. [1913 Webster]
3. To drench, as by an immersion; to wet throughly. [1913 Webster]
Although I be well soused in this shower. --Gascoigne. [1913 Webster]