have someone or something taped
have (or get) someone or something tapedunderstand someone or something fully. British informal
Early examples of the phrase, dating from the early 20th century, do not make its development clear: the sense could derive either from the action of measuring someone with a tape measure or from that of tying someone or something up with tape (and thereby getting them under control).
2001 John Diamond C: Because Cowards Get Cancer Too After a few false starts you've learned how to do sending the meal back, dropping the girlfriend, getting through the job interview, making the marriage proposal: you think you've got it taped.