dial. a. Froth, foam; b. (See quot. 1890.)
1838. in Holloway, Provinc.
1886. in Elworthy, W. Somerset Word-bk.
1890. Gloucestersh. Gloss., Fob, a little bunch or tuft, as of wool, etc.
Hence Fob v., to froth or foam.
1838. Holloway, Dict. Provinc., Fob. To froth as beer does when poured out quickly. E. Sussex.
1883. Hampsh. Gloss., Fob, to froth as beer.