Definition of doggo adverb from the Oxford Advanced Learner's Dictionary

 

doggo

 adverb
adverb
BrE BrE//ˈdɒɡəʊ//
 
; NAmE NAmE//ˈdɔːɡoʊ//
 
lie doggo(old-fashioned, informal)
 
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to lie still and quiet, so that other people will not notice you Word Origin late 19th cent.: of obscure origin; apparently from dog + -o.