Tortoise, e.g

• Person who doesn't move very fast
• Hardly a speed demon
• Highway hazard
• Slug
• Dawdler has to stick on second base

Wikipedia Word definitions in Wikipedia
Slowpoke or Slow Poke may refer to: Fictional characters : Slowpoke and Slowbro , fictional species of creatures in Pokémon media Slow Poke (Transformers) , a fictional character Slowpoke Rodriguez , character in Looney Tunes Slowpoke Antonio, Jerry's cousin ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
also slow poke , 1848, American English from slow (adj.) + poke (n.3), the name of a device, like a yoke with a pole, attached to domestic animals such as pigs and sheep to keep them from escaping enclosures. Bartlett (1859) calls it "a woman's word."

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM OTHER ENTRIES ▪ Hurry up, slowpoke !

Wiktionary Word definitions in Wiktionary
n. (context US Canada English) A mild insult for a person that moves slow.