adjective

extremely tired; exhausted.

we were all absolutely fagged out

exhausted,tired,tired out,worn out,fatigued,weary,wearied,drained,sapped,spent,washed out,on one’s last legs,done in,all in,dog tired,dead beat,dead on one’s feet,fit to drop,shattered,bushed,frazzled,worn to a frazzle,knackered,tuckered,pooped