As made famous by the television show "The New Adventures of Old Christine"; a porch tease is a female who leads a guy on for a prolong period of time, but never lets him past the front porch because she was never really interested in him to begin with. Said porch may be literal or hypothetical.
Guy #1: Hey bro, so what's the deal with you and Lisa? Are y'all official yet?
Guy #2: Nah man, she won't even let me inside her house.
Guy #1: Sounds like you've got yourself a porch tease, dude.