A phrase used scornfully & contemptuously to someone who keeps making their interest in a subject or person especially apparent.
Can be - and often is - shortened to HYH.
Guy: Atsuko is so hot! Have you seen her new character designs? They're really hot. Don't you think Atsuko is the most hot? She is. She's the hottest, Atsuko.
James (rolls eyes): Hide your hard-on, mate.
Guy: Don't you guys love Sakura Wars? It's so cool.
James: Yeah...it's OK. We were actually just discussing British escapes from Colditz.
Guy: Oh my god! That's EXACTLY like Sakura Wars! Did you know that-