(I made this post last week, but everything after the actual B Emoji was blanked for some reason and all my work was lost. I still have the image links I was going to post, but I'll have to rewrite the rest as best I can and without the actual Emoji. I wasn't going to do this at first, but I changed my mind. The memes are more important than my annoyance.)
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The B Emoji, also known as "B Button (blood Type)" and "Negative Squared Latin Capital Letter B", has seen memetic popularity in recent months, both ironically and sincerely, as a letter replacement as well as for "B" as in Deadass, B. A 2005 Urban Dictionary entry says "the word is a derivative of Brother, was, through usage, shortened to Bro, and finally condensed to just B", though the slang is likely much older, as it is strongly associated with the "New York nigga" stereotype.
Image macros using the B Emoji are usually parody "ghetto memes", which are already known for heavy ironic usage of Emojis, in the style of such memes as (and often in conjunction with) Smash the Like, Real Nigga Hours, Timbs, Spell ICUP Nigga, etc. The Emoji may be used to replace actual instances of the letter, or other letters, particularly "C". This comes from the Bloods' practice of replacing "C" in words with "B" in reference to their gang rivalry with the Crips. Eventually, as the meme spread, any arbitrary letters at all became replaceable with the Emoji.
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While researching for this post (last week), I discovered another related phrase that's perhaps due for another entry: "Wuss Poppin B" (and the "Wuss Poppin Jimbo" variant said by Jimmy Neutron character Hugh Neutron to his son Jimmy). Many of these use the B Emoji, while others don't. It seems to have spread among the same communities of people on such sites as Instagram, Twitter, and iFunny. Since it's one of these new age memes that half-normie, half-self aware "dank meme" kiddies post and repost on these sites, it may be impossible to find their exact origins.
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Plenty further examples of both can be found in searches as text posts, YouTube video titles, and image macros.