I've heard the phrase used often. Does it just mean being expelled from the party? Seems like an extreme thing to do when Dáil arithmetic is tight. If it's not expulsion from the party, then how does it punish a TD for bad behaviour? Is it the loss of some privilege? Does it have any material effect on a TD or is it just a symbolic gesture?
Edit: Thanks for the answers. Seems to mean it's a suspension from the party on paper but in practice it's probation til people forget about whatever you did and something to make the leader look tough while the issue is in the papers.
Also, there's a worrying amount of BDSM answers. Guess the whip thing was an open goal.