1. (adj.) done hastily; haphazard; careless
2. (adv.) in a hasty or careless manner
3. (verb) to slap someone (preferably in the face) and then dash, i.e. run away*
*This must be preceded by the slapped person being tricked into reading the word (slapdash), not necessarily aloud.
I just got slapdashed, now I must have my revenge