Dapper Acorn is a post-Superancient tier summon that is the EX variant of Magic Acorn. It summons a dapper squirrel with either a top hat or a fez on its head to fight for you. They attack by throwing magical acorns.
The best modifier is Mystic or Masterful due to the minions not dealing knockback or deal critical hits.
The monologue of the dedicatee in the tooltip is a reference to multiplayer with mods breaking the game a lot with bugs or crashes.
The minion is based off a squirrel due to the fact that Top Hat Squirrels are often associated with the dedicatee, along with the fact that a Top Hat Squirrel NPC, critter, and weapon is featured in the dedicatee's own mod.