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A San Francisco radio host has been sacked after he described 17-year-old Olympic snowboarder Chloe Kim as a "little hot piece of a**".

Program director Jeremiah Crowe of KNBR-AM said in a statement on Wednesday that host Patrick Connor has been fired after the comments he made on another radio station.

On Tuesday, on the Barstool Sports network on SiriusXM, Mr Connor made the vulgar comments about Ms Kim, then said "the countdown is on" until her 18th birthday.

Mr Connor apologised on Twitter, conceding that the comments were "more than inappropriate" and explaining they were "a weird attempt to make people laugh".

Without referring directly to Mr Connor, Barstool Sports founder Dave Portnoy said on Twitter that his network sometimes misses the mark with humour.

However he also appeared to hit back against the backlash, saying "cry babies and jealous people" will not dictate the station's actions.

Ms Kim, of Torrance, California, won gold in the women's halfpipe Tuesday at the Pyeongchang Olympics.