The Starships rapper joined the 53-year-old singer on stage at the event in February and while the pair locked lips, Nicki, 29, insists she had didn't plan it.
During an appearance on The Graham Norton Show, she said: "You can't really call it making out. She kissed me but I didn't kiss her back. I wasn't expecting it and I was shocked like everyone else. I was shaking and thinking, 'Is this really happening, why is she doing this?'
"It was the strangest thing (...) she had very soft lips."
'Voice in my head'
Meanwhile, Nicki claims a voice in her head told her to delete her Twitter account earlier this week after she got angry about her music being leaked online but Nicki has pleaded for her fans to stand by her.
She explained: "A voice in my head told me to delete my Twitter and that's what I did. I had 11 million followers and I hope they will wait for me. I miss my Barbz, please wait for me."
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