From The Collaborative International Dictionary of English v.0.48 [gcide]: Slap \Slap\, v. t. [imp. & p. p. Slapped; p. pr. & vb. n. Slapping.] To strike with the open hand, or with something broad. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]: Slap \Slap\, adv. [Cf. LG. slap, G. schlapp. See Slap, n.] With a sudden and violent blow; hence, quickly; instantly; directly. [Colloq.] "The railroad cars drive slap into the city." --Thackeray. [1913 Webster] From The Collaborative International Dictionary of English v.0.48 [gcide]: Slap \Slap\, n. [OE. slappe; akin to LG. slappe, G. schlappe; probably of imitative origin.] A blow, esp. one given with the open hand, or with something broad. [1913 Webster] From WordNet (r) 3.0 (2006) [wn]: slap adv 1: directly; "he ran bang into the pole"; "ran slap into her" [syn: bang, slap, slapdash, smack, bolt] n 1: a blow from a flat object (as an open hand) [syn: slap, smack] 2: the act of smacking something; a blow delivered with an open hand [syn: smack, smacking, slap] v 1: hit with something flat, like a paddle or the open hand; "The impatient teacher slapped the student"; "a gunshot slapped him on the forehead"