Top Definition
Many men envy this elusive type of chub (erection). While attaining a 1/2 or even 3/4 chub is a well respected achievement, the Harry Potter Chub is a holy grail in the eyes of a man. The reference to Harry Potter is a nod to the Platform 9 and 3/4 as initially seen in the book. Such an erection, thus, goes beyond the normal realm of chubs. When a man surpasses the half chub with ease, a Harry Potter Chub is likely to arouse, while mysteriously skipping past all numbers in between.

To attain such a desirable chub, a man is usually subject to seeing an extremely attractive woman and/or objects such as HBT, jeeps, beer, colorado, sandwiches etc. This certain chub can cause pants to tighten and young children to scream. Use caution.
Also known as the HP chub or the Ron Jeremy Chub (RJ chub), who subsequently has a 9 and 3/4 inch penis at full girth. It's not a coincidence.
Mike: Hey have you seen any hotties lately?
Jeff: Yeah, there was this really hot chick in my accounting class. She was giving me a solid Harry Potter Chub.

Mike: Skeet skeet!

Jeff: Why are both our dicks so big, Mike?
Mike: We have been blessed by Hagrid!
by pudslapp48 November 02, 2010

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