Green’s Dictionary of Slang

1. an act of expulsion, e.g. from a theatre.

1882

Bristol Magpie 12 Oct. 9/1: The would-be talker [...] in a Theatre, finds small chance of distinguishing himself [...] The justice meted is summary [...] even to the extent of a ‘chuck out,’ if necessary.

2. (Aus./N.Z.) a dismissal (from a job).

1914		Sport (Adelaide) 14 Feb. 9/1: They Say [...] That Poor old Mull got the chuck out because he was a T.T.
2003		McGill Reed Dict. of N.Z. Sl. 47: chuck-out Ejection or dismissal, usually the sack. Late C19 ANZ.

3. the end of drinking time in a public house, or place of entertainment, when customers are asked to drink up and leave.

1904		‘G.B. Lancaster’ Sons O’ Men 134: If Lane ’as hany last rud’ments of sense ’e’ll give us the chuck-hout ’stead of beer.
2001		N. Barlay Hooky Gear 180: Its the sort of party wha happen every Sat night in every shitarse burb with whoevers left standin in the local at chuck-out.