We also use Mama, but our word for Mother is "Mamã". Yet Mama is also our word for Tit. Mamar (To suck) is also how babies are fed. Then we get phrases like "Mama na mama da mamã" (Suck on mom's tit). It can get VERY amusing, LOL.
The funniest part of using Chupa, for a blowjob, is that when someone asks if you want Ketchup, it sounds like "Queres que te chupe?" (Do you want me to suck you?) Unsurprisingly, many times the answer is an automatic Yes, even if the Ketchup stays untouched. I wonder why...
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There's also the fact that we call "Tomates"(Tomatoes) to Testicles. The joke is multi-level.
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Peace