And supporters have perceived it as a jibe at West Ham United co-owner David Sullivan. Indeed, Sullivan has recently spoken about the QPR forward and West Ham fans understood Austin's tweet to be aimed at him.
Newcastle supporters also got involved on Twitter as they are still clearly keen on Austin joining the Magpies.
The 26-year-old scored for QPR on Wednesday night as the R's came back from 2-0 down to beat Wolves 3-2.
The cheeky ..............— Charlie Austin (@chazaustin9) August 20, 2015
According to ITV News, Sullivan told a podcast that West Ham haven't forked out £15 million on the QPR forward (yet) as he has doubts over his quality and fitness.
And both West Ham and Newcastle fans had plenty to say to Austin in response to the tweet.
Some of the Hammers faithful defended their co-owner, others sympathised with the QPR striker. R's fans also urged him to stay at Loftus Road, while Newcastle supporters got involved in the hope that their club can still sign a new striker - preferably Austin.
Here's a selection of the replies...
@chazaustin9 what he's saying is right, ur 18 goals didn't keep qpr up, and 15m wey 1 year contract left???? Plus u have failed medical b4— Mark Junkin (@markjunkin84) August 20, 2015
@chazaustin9 guess thats west ham off your christmas card list!— Chris Carr (@eggydipshit) August 20, 2015