'Coochy-coo' etc: additional vacuous expressions embraced by yours truly (9)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

An envelope (’embraced by’) of OTHER (‘additional’) plus ES (‘vacuous E xpression S ‘) in ME (‘yours truly’). I could not find MOTHERESE in my Chambers, but is is in Collins online, and in Wikipedia, under baby talk.