The word pillabas is the imperfect form of pillar in the second person singular. There are other translations for this conjugation.
See the full pillar conjugation

pillar

Todavía puedo oírte riendo y gritando de alegría cada vez que me pillabas.
I can still hear you laughing and squealing with joy every time you got me.
No te hagas la inocente, siempre me pillabas cosas que había escrito o dicho, memoria selectiva.
Don't play innocent with me. You always co-opted things I wrote, things I said.
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