Question

آقا آدامس پشت شلوارتون چسبیده

Answer 1

you've got gum over your clothes(pants)

Comments

Over should be on. "Over" refers to a surface or sometime means "above". If you wanted to say all over your pants, then over would have made sense. 

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the truth of the matter is that this is the way native speakers convey the meaning and there is no definite way of saying so it would be great if you let us know any alternative to the answer i gave.

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I just meant "over" has to be replaced by "on", otherwise everything else is correct.

Answer 2

Sir gum stuck behind pants