Green’s Dictionary of Slang

deadeye n.

1. a term of abuse.

[US](con. 1843) Melville White-Jacket (1990) 16: Why, you dead-eye!

2. a blank wall.

[UK]Story of a Lancashire Thief 12: The tile-maker did a roaring trade. He’d bill the dead eyes with posters as tall as himself!

3. the anus [SE dead + -eye sfx].

[US]B. Rodgers Queens’ Vernacular 17: the man who fucks in anal intercourse, as opposed to the one who is fucked [...] deadeye dick (the dead eye being the anus).
[US]R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].
[US]Randolph & Legman Ozark Folksongs and Folklore I 401: Hog-eye means, gallantly, the vagina, not to be confused with ‘dead-eye,’ meaning the anus.