Sc. and north. dial. [Cf. SNOTTER sb.1]
The Eng. Dial. Dict. contains other dial. uses.
1. intr. To breathe heavily; to snuffle, snore or snort.
1710. Ruddiman, Gloss. Virgil s.v. Snokis, Perhaps it may signifie smels or snuffs by sucking in the breath at the nose; which also we call Snottering, or Snokering, or Sniftering.
1724. Ramsay, Health, 288. All day he snotters, nods, and yawns.
1776. Herd, Collect. Songs, II. 98. Thou turns sleepy and blind, And snoters and snores far frae me.
1849. in dial. glossaries and texts.
2. To snivel or snuffle in weeping.
1781. J. Hutton, Tour to Caves (ed. 2), Gloss. 96. Snotter, to sob or cry.
1818. Scott, Hrt. Midl., xxiii. What signified his bringing a woman here to snotter and snivel, and bather their Lordships?
1825. in northern dial. glossaries, etc.