Is a guy grabbing a girl's arm a sign of flirting and hint he likes her?

i was standing with this guy..and I cracked a joke and he was laughing...and using laughing as an excuse he grabs my arm, squeezes it, leans on me and continues laughing...

what does it imply? because I've never experienced this before
Is a guy grabbing a girl's arm a sign of flirting and hint he likes her?
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