I was getting annoyed about the amount of posts about one particular topic on my timeline this morning and I decided I could fix the issue with some jQuery.
var term = $('.twitter-anywhere-tweet-box-editor').val();
$(".stream-item:contains('" + term + "')").css('display','none');
If you save it as a bookmarklet you can use this by typing the term you want to disappear from your timeline in the search box and then clicking the bookmarklet.
javascript:var term = $('.twitter-anywhere-tweet-box-editor').val();$(".stream-item:contains('" + term + "')").css('display','none');
That has no practical application really as it doesn't persist over page reloads and only lets you do one phrase at a time, but it helped me vent some frustration at dumb tweets!