Is playful physical contact usually seen as flirtatious?

There’s this girl I work with who I kinda like has and she’s been acting sort of flirty with me for the past few months (teasing me, laughing at everything I say, copying a lot of slang I use, etc…)

Well yesterday I teased her about something and she started laughing, grabbed a sticker and slapped in on my arm. Is this usually seen as flirtatious? I’ve never seen her do that with another coworker either

Is playful physical contact usually seen as flirtatious?
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