He does not call the ghost that appears at his supper-table that, but he does use the word to describe the image of Banquo conjured up by the witches, who proudly displays the line of kings descended from him. "Boltered" is a very obscure Warwickshire term which could only possibly be used by someone who grew up there, and means "grimy", "smeared", or, of hair "clotted" or "matted".
See attached link.
Macbeth calls the ghost of Banquo "blood-boltered" because he sees Banquo covered in blood, which symbolizes the violence and murder Macbeth committed to secure his throne. The term "boltered" suggests that Banquo's wounds are clotting, indicating a gruesome and unnatural death.
Macbeth sees the ghost of the recently murdered Banquo.
The ghost of Banquo.
Macbeth kills Banquo in the play and then Banquo's ghost haunts Macbeth.
In both cases, the ghost that appears in Macbeth is summoned by the guilt and inner turmoil of Macbeth himself. The ghost of Banquo is a manifestation of Macbeth's guilt over his role in Banquo's murder, while the ghost of Lady Macbeth represents his guilt over her death and his descent into madness.
Macbeth is telling Banquo's ghost not to shake his head at him. Banquo knows that Macbeth had him killed and is filling Macbeth's heart with shame but shaking his gory locks at him. His face is covered in blood and he has many gashes on his head, which is where the blood/gore would be coming from.
Macbeth kills Banquo in the play and then Banquo's ghost haunts Macbeth.
The ghost of Banquo appears to Macbeth one time during the banquet scene in Shakespeare's play "Macbeth."
Banquo's ghost. But let's be fair; Macbeth told him to "fail not our feast", and Banquo didn't, even though he was dead.
Macbeth
Macbeth sees the ghost of the recently murdered Banquo.
Macduff takes Macbeth's place at the banquet in the play "Macbeth." Macbeth had planned to sit at the head of the table but gets unsettled by Banquo's ghost, so Macduff takes his place instead.
In Shakespeare's play "Macbeth," the ghost that haunts Macbeth is the ghost of Banquo, a former friend whom Macbeth has murdered in order to secure his position as king. The ghost appears during a banquet hosted by Macbeth and is only visible to him, causing Macbeth to react with guilt and terror.