slang. Also blowing. A wench, trull.

1

1812.  J. H. Vaux, Flash Dict., Blowen, a prostitute; a woman who cohabits with a man without marriage.

2

1823.  Byron, Juan, XI. xix. With black-eyed Sal (his blowing).

3

1851.  Kingsley, Yeast, xi. A short simple service … that might catch the ears of the roughs and the blowens.

4