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From The Collaborative International Dictionary of English v.0.48:
outtasight \out`ta*sight"\ (out`t[.a]*s[imac]t"), a. [Compressed form of out-of-sight.] same as groovy, sense 1. [informal, 1960's] Syn: bang-up, bully, cool, corking, cracking, dandy, far-out, great, groovy, keen, neat, nifty, not bad(predicate), out-of-sight, peachy, psychedelic, slap-up, swell, smashing. [PJC]