Sentence:  Alf told me that one young white stockman, eager to impress the girls, went outside and mounted his horse, then began showing off his prowess, racing past the pub, wheeling and <WSD>reefing</WSD> his horse up and down the street, yackeyeing and whooping, flogging his horse with a battered old hat and always turning towards the pub to see if the girls were watching these feats of horsemanship. 
Meaning of the word marked with <WSD> tags:  To pull or yank strongly, especially in relation to horse riding.