This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A spack; a clumsy or foolish person.

"Used as a verb it is not offensive. ie: Use mulch to retard water evaporation and weed growth. it is both big and clever to use the word retard, although "spacker" is probably better."