Webster’s Revised Unabridged Dictionary · 1913
Slapdash
Slap′dash′ (·dăsh′), adv. [Slap + dash.] 1. In a bold, careless manner; at random. [Colloq.]
2. With a slap; all at once; slap. [Colloq.] Prior.
Slap′dash′, v. t. 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.