Excellent, wonderful, mean, topping, superb, fantastic, tremendous, marvellous, terrific, mega, sovereign, awesome, dope, admirable, first-rate, wicked cool, def, brill, boffo, bitchin’, chillin’, GR8, sweet, rad, amazing, gnarly, fun, groovy, dank, fantabulous, phat, tubular, boss, nice, best, rockin', chill, hip, ballin'... In one word: yeah!