Top Definition
when you remember something that used to make you happy and get metaphorically hard about it.
Pokemon! nostalgia boner!
by LGOE April 22, 2011
1 more definition
When you get a boner from something you forgot but now remember
John told me about his nostalgia boner he had last night before having sex with Mary.
by Fireside56 January 31, 2014

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