To stare down a guy or girl in a lustful way.
Dude, that girl over there is eyeball fucking the shit out of you right now... go talk to her!
Jeff isn't really feeling the vibe in here. He said he's just going to sit over in the corner and eyeball fuck girls till we're ready to go
To stare intently at another person, especially as an indication of hostility.
"Don't you eyeball fuck me, asshole!"