off the wall

(Slang) strange, peculiar; unusual

Off the Wall is African American pop and R&B singer Michael Jackson's fifth solo album. The album is often hailed as his breakthrough effort and was a major success for the Jacksons frontman, despite critics who said Jackson's career was doomed after leaving Motown Records in 1975. In December 1995, the RIAA certified Off the Wall at 7x Platinum for sales of 7 million in the United States alone, and the album has thus far sold 20 million copies worldwide. For a while, it was the biggest recording by a black artist in history.
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Adjective
1. conspicuously or grossly unconventional or unusual; "restaurants of bizarre design--one like a hat, another like a rabbit"; "famed for his eccentric spelling"; "a freakish combination of styles"; "his off-the-wall antics"; "the outlandish clothes of teenagers"; "outre and affected stage antics"
(synonym) bizarre, eccentric, freakish, freaky, flaky, outlandish, outre
(similar) unconventional

unrelated, unusual, off topic His idea of selling time is really off the wall - quite strange.

Synonyms and related words:
absurd, balmy, bananas, barmy, bats, batty, beany, bonkers, buggy, bughouse, bugs, crackers, cuckoo, curious, daffy, dippy, dotty, eccentric, flaky, flipped, freaked out, freaked-out, freaky, fruitcakey, fruity, funny, gaga, goofy, haywire, just plain nuts, kooky, loony, loopy, nuts, nutty, odd, oddball, off, off the hinges, off the track, out, outlandish, passing strange, peculiar, potty, quaint, queer, round the bend, screwball, screwballs, screwy, singular, slaphappy, strange, unearthly, wacky, weird, wondrous strange