An informal successor to the NeilCall.
The basic idea is to wait for someone to say something appropriate, (as with the Neil call), and follow it up with:
"You know who else xxxxx? YA MUM"
The caps are a requirement, as is the new line, although the final "YA MUM" may be omitted altogether for brevity -- everyone knows it's coming anyway. Currently, Infomer adds the "YA MUM" to save you the trouble.
When spoken, emphasis should be strongly on the "MUM".