Slapdash

Part of speech: verb (v.)

To apply, or apply something to, in a hasty, careless, or rough manner; to roughcast; as, to slapdash mortar or paint on a wall, or to slapdash a wall. [Colloq.] Halliwell.

Part of speech: adverb (adv.)

1. In a bold, careless manner; at random. [Colloq.]

2. With a slap; all at once; slap. [Colloq.] Prior.