Turns out that:
The Abominable Snowman was really a guy who dressed up in a heavy snow suit and delivered pizzas. He wears a white furry coat that makes him resemble a snow monster, and has glowing red eyes for an unexplained reason whenever he has his hood over his head. He appears much larger in size than anyone else while wearing his coat. When he removes his snowsuit, he is a muscular blond supermodel with "rock hard abs". Vicky becomes upset at Timmy for chasing him away from her, because he was a total hunk, not a monster.