45 simply has no meaning, therefore it cannot completely be defined. it is just simply a filler word. but, it is also a nice number to piss CoraROYALTY off.
This number, while it looks innocent and all, and it is just 3 digits above the meaning of life, actually translates to 69 if you translate it from Hexadecimal to decimal. This is only known by the hugest of nerds, but it hides the real conversation real good.
Kyle: Hey, did you know that Kevin got 45?
Carl: Wow, he must be lying man!
Ms Petunia: Boys what are you talking about?
Kyle: We were just discussing Kevins high score in this new dating sim that came out
Carl: *Snort*
Ms Petunia: Aw whatever, kids these days.