Slap
Slap , noun
[Old English slappe; akin to LG. slappe, German schlappe; probably of imitative origin.]
A blow, esp. one given with the open hand, or with something broad.
Slap , transitive verb
To strike with the open hand, or with something broad.
Slap , adverb
[Compare LG. slap, German schlapp. See Slap, n.]
With a sudden and violent blow; hence, quickly; instantly; directly. [Colloquial]
The railroad cars drive slap into the city.