COTU boss Francis Atwoli fired salvos at Malindi Member of Parliament during Labour Day celebrations at Uhuru Park.
Mr Atwoli said that the outspoken MP was not his type and went on to add insult to injury by saying she lacked a fine waist.
If you thought that Aisha Jumwa was going to take Atwoli's attacks lying down, then you are in for a rude shock.
On Saturday during the funeral of Mzee Justus Mwanyaje Chitole, father of Kilifi County Woman Representative Getrude Mbeyu, Jumwa fired back.
She said that Atwoli lacked taste and compared herself to a V8 machine.
"Wewe Atwoli mimi nakujua. Wewe umezoea kupeleka mashine ya Probox unadhani utawezana na V8 wewe(I know you Atwoli, you are used to Proboxes. You think you can manage a V8), " she fired in a video that has been widely shared on social media.
Many social media users have taken the Probox remark as an indirect reference to Mary Kilobi who is Atwoli's wife.
Jumwa's rejoinder marks an escalation in her war of words with the COTU boss.
The legislator has taken umbrage at Atwoli's constant criticism of Deputy President William Ruto whose presidential ambitions she supports.
Atwoli has publicly said that Ruto will not garner the supper of workers if he is to run in 2022.
He entered a relationship with KTN Swahili news anchor Mary Kilobi who he now calls his wife.