If you hear someone say they are 'flat out', it means they are very busy.
E.g. 'This is my first week at uni. I’m flat out. I’ll have to meet you another time.'
If someone says 'far out', it means that something is surprising or shocking.
E.g. 'Far out! I left my phone at home and I only realised it when I got to uni.'
If someone says they've had an 'all-nighter', it means that they stayed...
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10 expressions you will hear as an international student in Australia