Green’s Dictionary of Slang

(UK Black) to imprison; thus bird off, to sentence.

2014		Perm ‘Dotty on the Ride’ 🎵 The law ’wan bird me you niggas ’wan dirt me.
2017		1011 ‘No Hook’ 🎵 Free Criminal he got birded / That’s a L but I know he'll firm it.
2020		G. Krauze What They Was 143: When you get sentenced you get birded off.
2021		Central Cee ‘Ruby’ 🎵 Now they’re both in jail and they just got birded.