A twinky, nerdy guy who is very obsessed with science and really cares about his scientific field. Basically a twink who is also a science nerd. Bonus points if they get really into talking about their scientific field to others without realizing they're going on and on because that's adorable. Unfortunately, most science twinks are straight. As a result, they may not even realize they're a science twink.
"I want to ask out that guy in our class. He's such a science twink. I want him to tell me about the Sapir-Whorf hypothesis and get all flustered when I kiss him to shut him up."
"You know he's straight right? Most science twinks are."
"Well shit."