Differentiate between DYKE and DIKE:
n. 1 dike: 7. a. A ridge, embankment, long mound, or dam, thrown up to resist the encroachments of the sea, or to prevent low-lying lands from being flooded by seas, rivers, or streams. (Oxford English Dictionary)
n. 2 dyke. Of obscure origin.
A lesbian; a masculine woman. Also attrib.
1942 BERREY & VAN DEN BARK Amer. Thes. Slang §405/3 Masculine woman,..dike, dyke.
The spelling DIKE is the proper etymological spelling for the ditch. The spelling DYKE is useful to make the difference clear.
Why do lesbians wear Dutch Boy hairdos? 'Cuz we alway have our fingers in a dyke.